adj. 25B6; adjective
the idea that nuclear power is safe is laughable : RIDICULOUS, ludicrous, absurd, risible, preposterous; foolish, silly, idiotic, stupid, nonsensical, crazy, insane, outrageous; informal cock-eyed; Brit. informal daft.
if it wasn't so tragic, it'd be laughable : AMUSING, funny, humorous, hilarious, uproarious, comical, comic, farcical.