self-flattery

uncountable

The holding of an unjustifiably high opinion of oneself or one's actions.

Japanese Meaning

自己に対する根拠のない過大評価をすること / 自画自賛、自己陶酔

His constant self-flattery made it hard for the team to trust his judgment.

彼の絶え間ないうぬぼれのせいで、チームは彼の判断を信頼しにくかった。

Sense（1）

The holding of an unjustifiably high opinion of oneself or one's actions.

When self-flattery is turned up high it gets your adrenaline pumping, it rivets your attention.