dinosaur

1 one that has passed the peak of effectiveness or popularity as an old-time big-city boss, he's become something of a dinosaur in today's political world Synonyms has-been, relicRelated Words dodo, fogy (also fogey), fossil, old-timer; fuddy-duddy, mossback, stick-in-the-mud, stodge [British], troglodyte; throwbackNear Antonyms comer, rising star, up-and-comer

2 something or someone that is unusually large and powerful not that his small lawn needed such a dinosaur, but he bought a riding mower anyway Synonyms behemoth, blockbuster, colossus, giant, dreadnought, elephant, Goliath, jumbo, leviathan, mammoth, mastodon, monster, titan, whale, whopperRelated Words amazon, giantess; bulk, hulk; heavyweight; juggernaut, steamrollerNear Antonyms lightweight, weakling, wimp, wisp; nonentity, twerp, whippersnapperAntonyms diminutive, dwarf, half-pint, midget, mite, peewee, pygmy (also pigmy), runt, shrimp