1. most extreme or remarkable of its kind
Usage: informal; euphemistic substitute for ‘damnedest’

1. one’s best effort or utmost ability
Usage: informal; typically used in phrase ‘do one’s darnedest’

Examples

• That’s the darnedest thing I’ve ever seen!
• She had the darnedest luck with finding lost items.
• I’ll do my darnedest to finish the project on time.
• He tried his darnedest to solve the puzzle.
• It was the darnedest coincidence meeting you here.
• The kids say the darnedest things sometimes.
• I’m doing my darnedest to understand this math problem.