damnedest
Concise Oxford English Dictionary © 2008 Oxford University Press:
damned /damd/
▶adjective informal used to emphasize one's anger or frustration.
■ (damnedest) N. Amer. used to emphasize the surprising nature of something: the damnedest thing I ever saw.
– phrases
do (or try) one's damnedest do (or try) one's utmost.
do (or try) one's damnedest do (or try) one's utmost.
'damnedest' also found in these Oxford entries:
