egomaniac
Like most egomaniacal athletes, these tennis stars air their gripes and grievances on Centre Court.
Her egomaniacal arrogance suggests professional success.
Toddlers can be very egomaniacal and scream for everything they want.

SMART Vocabulary: related words and phrases

Showing arrogance and conceit
(as) proud as Luciferidiom
airs and gracesidiom
arrogant
arrogantly
as if you owned the placeidiom
egoistic
egoistically
egomaniacally
egotistic
egotistically
patronizingly
pomposity
pompous
pompously
popinjay
swollen head
swollen-headed
talk down to someone
think the (whole) world revolves around youidiom
throw your weight aroundidiom

You can also find related words, phrases, and synonyms in the topics:

Selfishness