prod•i•galPronunciation: (prod\u0027i-gul), [key] —adj. 1. wastefully or recklessly extravagant: prodigal expenditure. 2. giving or yielding profusely; lavish (usually fol. by of or with): prodigal of smiles; prodigal with money. 3. lavishly abundant; profuse: nature\u0027s prodigal resources. —n. a person who spends, or has spent, his or her money or substance with wasteful extravagance; spendthrift.