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“hostile” in Latin

The English word hostile itself goes back to Latin hostis, through hostīlis.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

hostile
hostilis (having, showing, or, of things, indicating the feeling of an enemy; inclined to break out in open acts of hostility): inimicus (of an unfriendly disposition): infensus (incensed, enraged, embittered; denoting an excited state; it can only be used of persons or minds): infestus (whose hostile disposition threatens to show itself: denoting a quiescent state, it may also be used of things; spiculum, oculi, exercitus; and of countries). (The words are found in this connection and order.) inimicus atque infestus; infestus atque inimicus; infensus atque inimicus; inimicus infensusque: adversus (general term; opposed to); to anybody, alicui. To be hostile to anybody, inimico infensoque animo esse in aliquem: a hostile feeling, animus infestus or inimicus; infensus animus atque inimicus; animus hostilis; animus alienus (dislike, estrangement): to entertain hostile sentiments or feelings against anybody, inimicum, infestum, inimicum et infestum, or infestum et inimicum esse alicui; inimico infensoque animo esse in aliquem: very hostile feelings, aversissimo animo esse ab aliquo: to make anybody entertain hostile feelings against another, alicujus odium in aliquem concitare: to adapt a hostile feeling, spiritus hostiles induere (Tac., Hist. 4, 57, 3): to regard anybody with the most hostile feelings, aliquem animo iniquissimo infestissimoque intueri: to inspire anybody with hostile sentiments against another, odium alicujus in aliquem concitare; aliquem or alicujus voluntatem ab aliquo abalienare (to render averse or disinclined to): to become hostile to anybody, odium in aliquem concipere: in a hostile manner, hostilem in modum: a hostile country, hostium terra (an enemy’s country), hostilis terra or regio (Cic.), or armis animisque infesta inimicaque (Cic.).

Quick answer

What is the Latin word for hostile?
The usual Latin words for “hostile” are hostīlis, inimīcus, īnfēnsus; also īnfestus, adversus, spīculum. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.