Synonyms of damnedest
oddest (informal) • Today I heard the damnedest thing.
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• You must do your best to protect yourselves.
utmostIf you say that you are doing your utmost to do something, you are emphasizing that you are trying as hard as you can to do it.
• I'm going to do my utmost to climb as fast and as far as I can.
Thesaurus for damnedest from the Collins English Thesaurus
utmost; best (esp in the phrases do or try one's damnedest)