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Douglas Harper's Etymology Dictionary
self-aggrandizing

1798, from self- + aggrandizing (see aggrandize).

Wiktionary
self-aggrandizing

a. Describing actions intended to make oneself seem more important. boastful.

WordNet
self-aggrandizing
  1. adj. of or relating to or characteristic of self-aggrandizement [syn: self-aggrandising]

  2. exhibiting self-importance; "big talk" [syn: boastful, braggart(a), bragging(a), braggy, big, cock-a-hoop, crowing, self-aggrandising]