(n.) One who adapts his opinions and manners to the times; one who obsequiously compiles with the ruling power; -- now used only in a bad sense.

Benedict Arnold Brutus Judas Judas Iscariot Quisling Vicar of Bray apple-polisher archtraitor ass-licker backscratcher backslapper betrayer bootlick bootlicker brown-nose brownie careerist chameleon clawback cockatrice conniver conspirator conspirer courtier creature cringer double agent double-crosser double-dealer dupe egotist fawner flatterer flunky footlicker formalist fortune hunter groveler handshaker helot hog individualist informer instrument intrigant intriguer jackal kowtower lackey led captain lickspit lickspittle lone wolf loner machinator mealymouth minion monopolist narcissist peon plotter puppet quisling rat road hog schemer self-advancer self-pleaser self-seeker self-server serf serpent slave snake spaniel stooge suck sycophant temporizer timepleaser toad toady tool traitor treasonist trimmer truckler tufthunter turncoat weathercock yes-man