a. 不适合的, 不合体的, 不相配的

[ adj ]
not in keeping with accepted standards of what is right or proper in polite society
<adj.all>
was buried with indecent hasteindecorous behavior
language unbecoming to a lady
unseemly to use profanity
moved to curb their untoward ribaldry

Unbecoming \Un`be*com"ing\, a. [Pref. un- not + becoming.]
Not becoming; unsuitable; unfit; indecorous; improper.

My grief lets unbecoming speeches fall. --Dryden.
※ -- {Un`be*com"ing*ly}, adv. --
{Un`be*com"ing*ness}, n.