Antonyms of lively :
dull, inelastic, lethargic, monotonous, leaden, heavy, spiritless, lacklustre, unanimated, dreary, unenrgetic, bovine, lackluster, desiccate, humdrum, desiccated, drab, lustreless, uneventful, lusterless, arid, inactive, lazy, slow, indolent, quiescent, sluggish, idle, inert, quiet, stupid, unambitious, sleepy, tired, torpid, weary, apathetic, impassive, phlegmatic, stolid, boring, irksome, tedious, dead, inanimate, lackadaisical, languid, languishing, languorous, lifeless, limp, listless, vapid, asleep.
Examples of usage:
It is not so odd, after all, when you come to think of it, says Molly, considering he never goes anywhere, as I have heard, and that I lead quite as lively an existence. "Molly Bawn", Margaret Wolfe Hamilton.
I'm sorry to be obliged to leave you, captain, said he, as he stood ready to start, for, if I am not very much mistaken, you'll have lively times here before long. "Frank on the Lower Mississippi", Harry Castlemon.
So amusing, and lively and nice to every one! "The Twelfth Hour", Ada Leverson.