challenging   (TTS Sound)

The challenging has 3 Senses.

• ambitious, challenging
• 挑戦的
• requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"
• 自身の能力または資質をめいっぱい使う必要のある

• thought-provoking, challenging
• stimulating interest or thought; "a challenging hypothesis"; "a thought-provoking book"
• 刺激的な関心を促すさま

• intriguing, challenging
• disturbingly provocative; "an intriguing smile"
• 妙に刺激する