へま (translations)→ fault mistake pratfall
ろくでなし (translations)→ bastard bum jerk loon rat rotter shit shithead so-and-so sonuvabitch wastrel
失策 (translations)→ failure flaw
失敗 (translations)→ bafflement blowout boo-boo checkmate demise dud fatality flat fluke misfire shipwreck washout wrong