Definify.com

Webster 1913 Edition

Adj.

Having or manifesting an exaggerated idea of one’s own importance or merit.

self-important ‎(comparative more self-important, superlative most self-important)

Having, or behaving as if having, too high an opinion of one's own importance.
The assistant manager was a self-important fellow who strutted about the office barking instructions.

having too high an opinion of one's own importance