ambitious (from lat. ambitiosus ; Estar; de ) adj. Dominated by the ambition of a certain thing: He is ambitious of affection . ( To be ) adj. and n. It applies to the person dominated by the ambition of power, wealth or social position. It may not have a pejorative meaning: You should be more ambitious. adj It is applied to the work that pretends to be of great importance among those of its kind.