The Hardest GRE Words (and How to Remember Them)

What makes a GRE word hard?

A word is hard on the GRE for three reasons: it is low-frequency, so you almost never meet it in everyday reading; it is abstract, describing a temperament or a quality rather than a concrete thing; and it sits close to other words in meaning, so the test can bait you with a near-synonym that shifts the sense. Words like obdurate, intransigent, and recalcitrant all cluster around stubbornness, and telling them apart under time pressure is the real difficulty.

Raw definition length is not what makes these words tough. What makes them tough is that Text Completion and Sentence Equivalence test connotation and degree, not dictionary meaning. Knowing that mendacious means dishonest is not enough if you cannot separate it from perfidious, which adds betrayal of trust, or from prevaricate, which is the act of dodging the truth rather than a trait.

How to actually remember them: roots, mnemonics, and context

Start with the root. Pusillanimous is intimidating until you split it into pusillus, meaning very small, and animus, meaning spirit: a puny spirit, a coward. Perfidious hides fid, faith, the same root as fidelity, so a perfidious ally is one who has broken faith. Once a hard word is anchored to a root you already recognize, it stops being a random string of letters and starts making sense across a whole family of words.

Layer a vivid mnemonic on top of the root. A truculent person is easier to recall if you picture a truck driver aggressively cutting you off. A sycophant sticks if you imagine a sick elephant that follows you around flattering you for peanuts. The more absurd and sensory the image, the harder it is to forget, which is why silly hooks outperform serious ones.

Then lock it in with context. Seeing a word inside a real sentence, and then answering a question that turns on its precise meaning, is what converts recognition into usable knowledge. Spaced repetition brings each hard word back right before you would forget it, so the effort you spent learning obfuscate or saturnine is not wasted a week later.

How Grezi drills the hardest words

Grezi teaches its 1,000+ GRE words, including the hardest tier, inside short contextual stories rather than as bare list entries, and every word carries a root breakdown and a memory hook. From there the words feed straight into 4,500+ Text Completion, Sentence Equivalence, and Reading Comprehension questions, so you meet each hard word the way the test uses it. Spaced repetition weights the words you keep missing, and Zi, the built-in AI tutor, can build a fresh mnemonic or explain why a trap synonym is wrong on request.

25 of the hardest GRE words

Each of these is a genuinely hard, low-frequency GRE word. Tap any word for its full entry, example sentences, synonyms, and antonyms. Every one comes with a memory hook and its root so it sticks.

• obsequious adjective Obedient or attentive to an excessive or servile degree

  Memory hook: OB-SEQUI-OUS: following (sequi) someone around like a desperate puppy, excessively servile.

  Root: ob (toward)

• perfidious adjective Deceitful and treacherous; disloyal

  Memory hook: PERFIDIOUS holds FID (faith, as in Fido the faithful dog). Now imagine Fido turned traitor, leading burglars to your house: faith betrayed.

  Root: per- (through, away, detrimental)

• pusillanimous adjective Lacking courage or resolution; cowardly

  Memory hook: PUSILL-ANIMOUS: having a PUNY (pusillus) SPIRIT (animus), cowardly and spineless.

  Root: pusillus (very small)

• recondite adjective Little known; abstruse; dealing with very profound, difficult, or specialized subject matter

  Memory hook: RE-CONDITE: knowledge HIDDEN (conditus) away, so specialized only experts understand it.

  Root: reconditus (put away, hidden)

• sedulous adjective Showing dedication and diligence

  Memory hook: SED-U-LOUS: someone who SITS (sed) and works diligently without giving up.

  Root: sedulo (diligently, without deception)

• truculent adjective Eager to argue or fight; aggressively defiant

  Memory hook: TRUCK-U-LENT: imagine a TRUCK driver aggressively cutting you off, fierce and combative.

  Root: truculentus (fierce, savage)

• mendacious adjective Given to lying; dishonest

  Memory hook: Think mend-a-cious: a liar who can never MEND the truth, patching reality with falsehoods.

  Root: mendax (lying, false)

• obdurate adjective Stubbornly refusing to change one's opinion or course of action

  Memory hook: OB-DURE-ATE: hardened AGAINST change, stubbornly unyielding like something DURABLE.

  Root: ob (against)

• prevaricate verb To speak or act evasively; to avoid telling the truth

  Memory hook: PRE-VARI-CATE: straddling various positions to avoid the truth, speaking evasively.

  Root: prae (before)

• salubrious adjective Health-giving; healthy; conducive to well-being

  Memory hook: SALUBR-IOUS: think SALUTE to health, a salubrious climate promotes well-being.

  Root: salus (health)

• timorous adjective Fearful, timid, or lacking in confidence

  Memory hook: TIMOROUS: tiny TIMmy is so nervous he wants more of the crowd to hide in, too fearful to stand alone.

  Root: timor (fear)

• laconic adjective Using very few words; concise to the point of seeming rude or mysterious

  Memory hook: LACON-IC: like a SPARTAN from Laconia, famously few words. 'If.' was their reply to threats.

  Root: Lakonikos (from Laconia, Sparta)

• capricious adjective Given to sudden and unaccountable changes of mood or behavior

  Memory hook: CAPRI-cious: like a goat (CAPRA) jumping unpredictably from rock to rock, fickle and changeable.

  Root: capra (goat)

• ineffable adjective Too great or extreme to be expressed in words

  Memory hook: INEFFABLE = IN (not) + EFF (speak, as in effable): a feeling so huge you cannot put it into words; it is beyond speech.

  Root: effari (to utter, speak out)

• munificent adjective Very generous; lavish in giving

  Memory hook: MUNI-FICENT: making MONEY into gifts, extremely generous giving.

  Root: munus (gift)

• sycophant noun A person who acts obsequiously to gain advantage; a flatterer

  Memory hook: SYCO-PHANT: imagine a SICK ELEPHANT that follows you around flattering you for peanuts.

  Root: sykophantes (informer, false accuser)

• taciturn adjective Reserved or uncommunicative in speech; saying little

  Memory hook: TACIT-urn: TACIT means unspoken, and a taciturn person keeps things unspoken.

  Root: tacitus (silent)

• vituperate verb To blame or insult someone in strong or violent language

  Memory hook: VITU-PERATE: preparing to point out someone's VICES violently, to berate with harsh language.

  Root: vitium (fault)

• pellucid adjective Translucently clear; easily understood

  Memory hook: PER-LUCID: light passes THROUGH it clearly, translucently clear and easy to understand.

  Root: per (through)

• intransigent adjective Unwilling or refusing to change one's views or agree; uncompromising

  Memory hook: IN-TRANSIG-ENT: will NOT TRANSIT (move) from their position, stubbornly refusing to compromise.

  Root: in (not)

• obfuscate verb To render obscure, unclear, or unintelligible

  Memory hook: OB-FUS-CATE: cover in FUSCOUS (dark) fog, deliberately making things unclear.

  Root: ob (over)

• abstruse adjective Difficult to understand; obscure

  Memory hook: AB-STRUSE: the truth is pushed AWAY (ab), so abstruse ideas are hidden and hard to grasp.

  Root: abstrusus (hidden, concealed)

• recalcitrant adjective Having an obstinately uncooperative attitude

  Memory hook: RE-CALCITRANT: kicking BACK like a stubborn horse, obstinately uncooperative.

  Root: re (back)

• saturnine adjective Gloomy, sullen, or grimly serious in temperament

  Memory hook: SATURNINE: imagine SATURN as a grim, ringed planet sulking alone in the cold dark, a person born under that gloomy sign.

  Root: Saturnus (the planet Saturn, astrological gloom)

• desultory adjective Lacking a plan, purpose, or enthusiasm

  Memory hook: DE-SULT-ory: like a SOMERSAULT from topic to topic, random, aimless, no direction.

  Root: desultor (a leaper)

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