1 Recklessly extravagant or wasteful in the use of resources.
2 Licentious; dissolute.
A licentious, dissolute person.
Mid 16th century (in the sense ‘overthrown, routed’): from Latin profligatus ‘dissolute’, past participle of profligare ‘overthrow, ruin’, from pro- ‘forward, down’ + fligere ‘strike down’.
It is clear that the web editors at ODO were not profligate during their raucous New Year’s celebration, probably too liberal in their libations. They were downright stingy, sticking to the past.This morning, their web page repeated cosmography from yesterday. Ouch! Having gone to bed well before midnight, your intrepid word guide has your back, picking a word from elsewhere to meet the new year’s need. Happy 2018, everyone.