a kind of behaviour, style of speaking, that is not natural or genuine

pretended behavior to make an impression

extravagant behaviour designed to attract attention to oneself

attention-seeking behavior

being flamboyant

exhibitionism, flashiness

an exaggerated display of wealth, skill etc to get admiration or envy

exhibitionism, flashiness

the state of having too high an opinion of one's look, abilities etc

conceit, egotism