"that appears to be (real, proper, etc.), apparent to the senses or mind, having a semblance or appearance of being real," mid-14c., present-participle adjective from seem. Also "suitable, becoming" (mid-14c.), but this is obsolete. Seemingly in the sense of "to all appearances" is recorded from 1590s; earlier it meant "fittingly, properly, in the correct manner" (early 15c.).