obscene

Origin

From Middle French obscene (modern French obscène (“indecent, obscene”)), and from its etymon Latin obscēnus, obscaenus (“inauspicious; ominous; disgusting, filthy; offensive, repulsive; indecent, lewd, obscene”). The further etymology is uncertain, but may be from ob- (prefix meaning ‘towards’) + caenum (“dirt, filth; mire, mud”) (possibly ultimately from Proto-Indo-European *ḱweyn- (“to make dirty, soil; filth; mud”)) or scaevus (“left, on the left side; clumsy; (figurative) unlucky”) (from Proto-Indo-European *skeh₂iwo-). If from caenum, the unexpected extra -s- may be from a variant form of the original PIE root; a similar -s- exists in ex-.