Roget's Thesaurus: Entry 891 (Enemy)

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#891. Enemy. -- N. enemy; antagonist; foe, foeman[obs]; open enemy, bitter enemy,; opponent &c. 710; back friend. public enemy, enemy to society.

Phr. every hand being against one; " he makes no friend who never made a foe " [Tennyson].

with friends like that, who needs enemies?; Lord protect me from my friends; I can protect myself from my enemies.