Challenging

adjective
'ʧælɪndʒɪŋ

Adjective

  • requiring full use of your abilities or resources

    performed the most challenging task without a mistake

    Similar:Ambitious
  • stimulating interest or thought

    a challenging hypothesis

    Similar:Thought-provoking
  • disturbingly provocative

    Similar:Intriguing

Dictionary Validity

Tournament Word List (TWL)
Scrabble US
Collins Scrabble Words (CSW21)
Scrabble UK
ENABLE Dictionary
Words With Friends
Combined US/UK Scrabble Dictionary
SOWPODS
North American Scrabble (NWL2020)
NASPA