The Oxford Thesaurus An A-Z Dictionary of Synonyms - ambitious adj.

1) aspiring, hopeful; enthusiastic: My son, I am just as ambitious for you as you are for yourself. 2) energetic, enterprising, vigorous, zealous, enthusiastic, eager: We prefer ambitious young people to those who are seeking a sinecure. 3) greedy, avaricious, overzealous, overambitious, Colloq pushy, yuppy: Howard is a trifle too ambitious, expecting to be department head after only one year.