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am‧bi‧tious

1 determined to be successful, rich, powerful etc :
Alfred was intensely ambitious, obsessed with the idea of becoming rich.
Alfred was intensely ambitious, obsessed with the idea of becoming rich.2 an ambitious plan, idea etc shows a desire to do something good but difficult :
an ambitious engineering project
an ambitious engineering project —ambitiously adverb
—ambitiousness noun [uncountable]
