Given to frivolity or silliness.
Claiming that or behaving as if one is important or deserving of merit when such is not the case:
Having very strong opinions.
Beaumont and Fletcher
The definition of grandiose is something that is grand or magnificent or something that is trying to be impressive but is much too large, making it seem pretentious or overdone.
The definition of overbearing is someone who is bossy, arrogant or overwhelming in their power.
Characterized by exaggerated stateliness; pretentious, as in speech or manner; self-important
(comparative more swaggering, superlative most swaggering)
The definition of highfalutin is arrogant or pompous.
Feeling or showing justifiable self-respect:
(Idiomatic) A social or economic group wielding undue power, influence or economic clout.
Marked by little or no ornamentation or decoration:
Find another word for self-important. In this page you can discover 37 synonyms, antonyms, idiomatic expressions, and related words for self-important, like: hoity-toity, conceited, pretentious, egotistical, opinionated, smug, arrogant, grandiose, overbearing, pompous and snobbish.