Definitions from Wiktionary ( )

▸ noun:  (informal) A terrifying and dangerous creature, especially one of an imaginary or mythical kind.
▸ noun:  (informal, childish) A bizarre or whimsical creature.
▸ noun:  A cruel, heartless, or antisocial person, especially a criminal.
▸ noun:  (archaic) A deformed animal or person (especially, a severely deformed one); in previous centuries often taken as an ill omen at the time of its birth. (Offensive when applied to humans in modern usage.)
▸ noun:  (figuratively) A badly behaved person, especially a child; a brat.
▸ noun:  (informal) Something unusually large.
▸ noun:  (informal) A prodigy; someone very talented in a specific domain.
▸ noun:  (gaming) A non-player character that player(s) fight against in role-playing games.
▸ adjective:  (informal) Very large; worthy of a monster.
▸ adjective:  (informal) Great; very good; excellent.
▸ verb:  (transitive) To make into a monster; to categorise as a monster; to demonise.
▸ verb:  (intransitive) To behave as a monster to; to terrorise.
▸ verb:  (chiefly Australia) To harass.
▸ verb:  (UK, live action roleplaying games) To play (a series of) non-player characters as directed, without having the responsibility of organising the game itself; generally not limited to playing literal monsters or hostile combatants.
▸ verb:  (informal, British, transitive, intransitive) punish, reprimand or intimidate.

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