challenging

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. requiring full use of your abilities or resources (Freq. 3)
- ambitious schedule
- performed the most challenging task without a mistake
• Syn:
ambitious
• Similar to:
difficult, hard
• Derivationally related forms:
ambition (for: ambitious)
2. stimulating interest or thought
- a challenging hypothesis
- a thought-provoking book
• Syn:
thought-provoking
• Similar to:
stimulating
3. disturbingly provocative
- an intriguing smile
• Syn:
intriguing
• Similar to:
provocative

• Từ đồng nghĩa / Synonyms:
  take exception, dispute, gainsay