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The Collaborative International Dictionary
Unbeseeming

Unbeseeming \Un`be*seem"ing\, a. [Pref. un- not + beseeming.] Unbecoming; not befitting. -- Un`be*seem"ing*ly, adv. -- Un`be*seem"ing*ness, n.

Douglas Harper's Etymology Dictionary
unbeseeming

1580s, "not befitting, inappropriate, unsuitable," from un- (1) "not" + beseeming. A common 17c. word.

Wiktionary
unbeseeming

vb. (present participle of unbeseem English)