sinistral (adj.)youdaoicibaDictYouDict[sinistral 词源字典]
late 15c., "unlucky," from Old French senestral, sinistral or Medieval Latin *sinistralis, from sinister (see sinister). Meaning "on the left side" is from 1803. Related: Sinistrally.[sinistral etymology, sinistral origin, 英语词源]