Synonyms for great challenge

Synonyms for great

good (high, fine, superior >>)
wonderful (awesome, beautiful, remarkable >>)
big (large, grand, heavy >>)
fantastic
superb (outstanding, famous, excellent >>)
immense (huge, tremendous, enormous >>)
splendid
long
substantial
lovely (cool, marvellous, marvelous >>)
considerable
greater
sizable

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Synonyms for challenge

problem (difficulty, question, trouble >>)
goal
test

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