profligate

Concise Oxford English Dictionary © 2008 Oxford University Press:
profligate /ˈprɒflɪgət/

▶adjective recklessly extravagant or wasteful.

■ licentious; dissolute.

▶noun a profligate person.

– derivatives
profligacy noun,
profligately adverb.

– origin C16: from L. profligatus ‘dissolute’, past part. of profligare ‘overthrow, ruin’, from pro- ‘forward, down’ + fligere ‘strike down’.