English Reference
noun · adjective

instinct

n. · adj.
US /ˈɪnstɪŋkt/ in·stinct UK spelling instinct's, instinct's

  1. 01 B2 Upper Intermediate Science

    n.a natural way of acting that animals and people are born with.

    n.an innate, typically fixed pattern of behavior in animals in response to certain stimuli.

    Simple

    Birds have a natural instinct to build nests in the springtime.

    In context

    The migratory instinct in certain species of butterflies remains one of the most fascinating subjects in behavioral biology.

  2. 02 B2 Upper Intermediate

    n.a feeling that makes you do something without having to think about it first.

    n.a natural aptitude or intuitive way of acting or thinking without conscious deliberation.

    Simple

    My first instinct was to run, but I decided to stay and help.

    In context

    Her professional instinct told her that the deal was too good to be true, despite the impressive figures presented by the board.

  3. 03 C2 Proficiency ArchaicLiterary

    adj.filled or charged with a specific quality or feeling.

    adj.imbued or charged with a particular quality, emotion, or spirit.

    Simple

    The old forest was instinct with a strange and quiet energy.

    In context

    The poet described a landscape instinct with life, where every leaf and stone seemed to vibrate with a hidden spirit.

    Usage

    Usually followed by the preposition 'with'.

But when it is darker, during an eclipse, that instinct may not kick in, even while our eyes are being damaged.

BBC News· 13 Aug 2026

The twist is (and it’s really not much of a surprise) that the true enemy is not really the shark, which is only following its sharky instincts.

The Guardian· 12 Aug 2026

From Latin īnstīnctus, past participle of īnstinguō (“to incite, to instigate”), from in (“in, on”) + stinguō (“to prick”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin īnstīnctus
Level C1 · Advanced
Frequency Frequent
Updated