c. 1300, "visually unpleasing, unattractive, ugly;" mid-14c., "unfitting, indecent, inappropriate," from un- (1) "not" + seemly (adj.). Similar formation in Old Norse usoemiligr. Related: Unseemliness.
unseemly to use profanity
unseasoned
unseat
unsecure
unsecured
unseeded
unseemly
unseen
unselfish
unsentimental
unseparable
unsettle
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