Inborn pattern of behavior often responsive to specific stimuli:
— The spawning instinct in salmon.
— Altruistic instincts in social animals.

synonym: inherent aptitude.

Roget 450: intellect, mind, understanding, reason, thinking principle; rationality; cogitative faculties, cognitive faculties, discursive faculties, reasoning faculties, intellectual faculties; faculties, senses, consciousness, observation, percipience, intelligence, intellection, intuition, association of ideas, instinct, conception, judgment, wits, parts, capacity, intellectuality, genius; brains, cognitive powers, intellectual powers; wit etc. 498; ability etc. (skill) 698; wisdom etc. 498; Vernunft [G.], Verstand [G.].    soul, spirit, ghost, inner man, heart, breast, bosom, penetralia mentis [Lat.], divina particula aurae [Lat.], heart's core; the Absolute, psyche, subliminal consciousness, supreme principle.    brain, organ of thought, seat of thought; sensorium^†, sensory; head, headpiece; pate, noddle^†, noggin, skull, scull, pericranium [Med.], cerebrum, cranium, brainpan^†, sconce, upper story.    [in computers] [Comp.] central processing unit, CPU; arithmetic and logical unit, ALU.    [Science of mind] metaphysics; psychics, psychology; ideology; mental philosophy, moral philosophy; philosophy of the mind; pneumatology^†, phrenology; craniology [Med.], cranioscopy [Med.].    ideality, idealism; transcendentalism, spiritualism; immateriality etc. 317; universal concept, universal conception.    metaphysician, psychologist etc. ... show more

Roget 450a: absence of intellect, want of intellect etc. 450; imbecility etc. 499.    brutality, brute force.    instinct, brute instinct, stimulus-response loop, conditioned response, instinctive reaction, Pavlovian response.    mimicry, aping (imitation) 19.    moron, imbecile, idiot; fool etc. 501; dumb animal; vegetable, brain dead.    ... show more

Roget 477: intuition, instinct, association, hunch, gut feeling; presentiment, premonition; rule of thumb; superstition; astrology^†; faith (supposition) 514.    sophistry, paralogy^†, perversion, casuistry, jesuitry, equivocation, evasion; chicane, chicanery; quiddet^†, quiddity; mystification; special pleading; speciousness etc. adj.; nonsense etc. 497; word sense, tongue sense.    false reasoning, vicious reasoning, circular reasoning; petitio principii [Lat.], ignoratio elenchi [Lat.]; post hoc ergo propter hoc [Lat.]; non sequitur, ignotum per ignotius [Lat.].    misjudgment etc. 481; false teaching etc. 538.    sophism, solecism, paralogism^†; quibble, quirk, elenchus^†, elench^†, fallacy, quodlibet, subterfuge, subtlety, quillet^†; inconsistency, antilogy^†; a delusion, a mockery, and a snare" [Denman]; claptrap, cant, mere words; lame and impotent conclusion" [Othello]. meshes of sophistry, cobwebs of sophistry; flaw in an argument; weak point, bad case.    overrefinement^†; hairsplitting etc. v.. ... show more

Roget 601: involuntariness; instinct, blind impulse; inborn proclivity, innate proclivity; native tendency, natural tendency; natural impulse, predetermination.    necessity, necessitation; obligation; compulsion etc. 744; subjection etc. 749; stern necessity, hard necessity, dire necessity, imperious necessity, inexorable necessity, iron necessity, adverse necessity; fate; what must be.    destiny, destination; fatality, fate, kismet, doom, foredoom, election, predestination; preordination, foreordination; lot fortune; fatalism; inevitableness etc. adj.; spell etc. 993.    star, stars; planet, planets; astral influence; sky, Fates, Parcae, Sisters three, book of fate; God's will, will of Heaven; wheel of Fortune, Ides of March, Hobson's choice.    last shift, last resort; dernier ressort [Fr.]; pis aller etc. (substitute) 147 [Fr.]; necessaries etc. (requirement) 630.    necessarian^†, necessitarian^†; fatalist; automaton.    ... show more

Dutch: instinct

followed by `with' Deeply filled or permeated:
— Words instinct with love.

synonym: replete.