1. Animated; moved. See Instigate.

2. A natural impulse in animals to do what is necessary for existence, preservation, and propagation, independently of instruction and experience; an unreasoned prompting.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• instict,
• dinstinct,
• instinks,
• instaint,
• instuct,
• instinckt,
• instinctly,
• instract,
• instanct,
• enstinct,
• instenct,
• instincly,
• insitinct,
• instrincts,
• instect,
• insinct,
• instincs,
• insturct,
• instact,
• instint

• instancy,
• instilment,
• instil,
• instilling,
• inaesthetic,
• instigant,
• instant,
• instructive,
• instance,
• instead,
• institute,
• instigative,
• institution,
• inositol,
• instruct,
• instal,
• instigator,
• instill,
• in-situ,
• instep,
• instigate,
• In situ,
• instillator,
• instructor,
• instructed,
• instar,
• instigation,
• incitive,
• instantly,
• inactive,
• inmost,
• inaction,
• insatiate,
• instruction,
• inactivity,
• instantiate,
• install,
• instinctive,
• instinctual,
• inactivate.

The adverb form of "instinct" would be "instinctively".

The adjective form of "instinct" is "instinctive".

The plural of the "instinct" can be the "instincts".

The singular of the "instinct" can be the "instinct".