Etymology
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instinctive (adj.)

1640s, from Latin instinct-, past participle stem of instinguere "to incite, impel" (see instinct) + -ive. Related: Instinctively (1610s); instinctiveness. Coleridge uses instinctivity.

updated on December 13, 2015

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Definitions of instinctive from WordNet

instinctive (adj.)
unthinking; prompted by (or as if by) instinct;
offering to help was as instinctive as breathing
Synonyms: natural
From wordnet.princeton.edu, not affiliated with etymonline.