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Crossword clue: taxing to the utmost; testing powers of endurance

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

straining 9 letters wn-def

an intense or violent exertion

strenuous 9 letters wn-def

taxing to the utmost; testing powers of endurance

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Related clues

an intense or violent exertionAnother word for straining