damnedest
Damnedest (noun) means the greatest effort someone is capable of making. Example: “He did his damnedest to fix the leak before the guests arrived.”
How to use damnedest
Learner’s notesIn plain EnglishYour absolute best effort — as in "try your damnedest."
Informal; treat like a stronger version of "best."
Fill the gap
Can you complete this real example?
He did his _____ to fix the leak before the guests arrived.
Etymology
Superlative form of "damned," built the same way "biggest" comes from "big" — damned plus the ending -est.