ambitious
am-bi-tious
adjective
Requiring great effort, skill, or resources to be successful.
"They set an ambitious sales target."
adjective
Having a strong desire for success, power, or achievement.
"She is an ambitious young professional."
Thesaurus
Synonyms: difficult, challenging, hard, aspirant, pushful, overambitious, aspiring, determined, wishful, driven, pushy, compulsive
Antonyms: ambitionless, unambitious