Definition of self-flattering in US English:

self-flattering

adjective

  • Holding an unjustifiably high opinion of oneself or one's actions.

    ‘she is distorting facts to fit her own self-flattering image’

Pronunciation

self-flattering

/ˌselfˈfladəriNG//ˌsɛlfˈflædərɪŋ/