The word "unstriking" refers to something that is not remarkable or memorable. Its antonyms are words that describe things that stand out, command attention or make a strong impression. Some words that are antonyms for "unstriking" include "striking," "remarkable," "memorable," "noteworthy," "impressive," "distinguished," "outstanding," "exceptional" and "extraordinary." These words denote qualities or attributes that are noticeable, distinct or unique in some way. When used to describe a person, event or object, the antonyms of "unstriking" convey a sense of admiration, awe or respect, and are often used to indicate that something is worthy of attention or consideration.