damnedest — ONAD

damnedest /ˈdamdist, ˈdæmdɪst

▸ adjective North American informal used to emphasize the surprising nature of something:

it was the damnedest thing I ever saw.

– PHRASES
do one's damnedest (also try one's damnedest) North American informal
do or try one's utmost:

he's doing his damnedest to connect with every single person in the crowd on an individual level

I tried my damnedest to lift the ball.