The adjective pretentious means that someone seems important and significant but you do not think they are.
Synonyms are showy or ostentatious.
The word origin of pretentious comes from French, 1836, from prétention to prétentieux and noun of action from past participle stem of Latin praetendere.
It can be good to be a little bit pretentious sometimes.
It is pretentious to say it, but my performance was one of the best.
His CEO is somewhat pretentious, speaks in a monotonous style and craves for sympathy and attention.