INIMICAL
unfriendly, inimical
(adjective) not friendly; “an unfriendly act of aggression”; “an inimical critic”
Source: WordNet® 3.1
Etymology
Adjective
inimical (comparative more inimical, superlative most inimical)
Harmful in effect.
Unfriendly, hostile.
Synonyms
• inimic, inimicable, antagonistic
Source: Wiktionary
In*im"i*cal, a. Etym: [L. inimicalis, fr. inimicus unfriendly,
hostile; pref. in- not + amicus friendly. See Amity.]
1. Having the disposition or temper of an enemy; unfriendly;
unfavorable; -- chiefly applied to private, as hostile is to public,
enmity.
2. Opposed in tendency, influence, or effects; antagonistic;
inconsistent; incompatible; adverse; repugnant.
We are at war with a system, which, by its essence, is inimical to
all other governments. Burke.
Source: Webster’s Unabridged Dictionary 1913 Edition