Synonyms of 'staying power'
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a test of endurance
Stamina is the physical or mental energy needed to do a tiring activity for a long time.
You have to have a lot of stamina to be a top-class dancer.
Someone's strength in a difficult situation is their confidence or courage.
Something gave me the strength to overcome the difficulty.
Thesaurus for staying power from the Collins English Thesaurus
If you have staying power , you have the strength or determination to keep going until you reach the end of what you are doing.