Appropriate, suitable, proper, or becoming in appearance or behavior.
Present participle of 'beseem' used as an adjective, following the pattern of 'becoming,' 'fitting,' and 'seeming.' The '-ing' form suggests an active quality of appropriateness.
Medieval etiquette books use 'beseeming' to describe dress, speech, and manners—'a beseeming attire for a noblewoman' means both fashionable and morally proper. It's dressing right plus being right.
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