- fifth columnist as a noun:
- 1
fifth columnist
noun
1 fifth columnist
A member of a clandestine subversive organization who tries to help a potential invader.
synonym: saboteur.
Dutch: saboteur
Moby thesaurus: Trojan horse, apostate, backslider, bolter, collaborationist, collaborator, convert, crypto, defector, deserter, fellow traveler, fifth column, fraternizer, mugwump, proselyte, quisling, recidivist, recreant, renegade, renegado ... show more.
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