1. cockamamie
2. cockamamy, goofy, sappy, silly, wacky, zany, unreasonable, foolish, balmy
2. barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, insane