a. Not assuming; not bold or forward; not arrogant or presuming; humble; modest; retiring; as, an unassuming youth; unassuming manners. [ 1913 Webster ]
(adj) excessively forward, Syn. presumptuous, assuming, Example:an assumptive person; on a subject like this it would be too assuming for me to decide; the duchess would not put up with presumptuous servants