Etymology
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self-important (adj.)

"having or showing an exaggerated estimation of one's own importance, pompously egotistical," 1728, from self- + important. Related: Self-importance (1728); self-importantly.

updated on April 19, 2022

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Definitions of self-important from WordNet

self-important (adj.)
having or showing feelings of unwarranted importance out of overbearing pride;
Synonyms: arrogant / chesty
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.