unfailing

Từ điển tiếng Anh - Cambridge Advanced Learners Dictionary

unfailing UK US [ʌnˈfeɪ.lɪŋ] adjective
describes a positive quality of someone's character when it shows itself at all times
• unfailing enthusiasm
Thesaurus⁺: ↑Having a powerful effect ↑Strong feelings ↑Very and extreme
Derived: unfailingly

• Từ đồng nghĩa / Synonyms:
  unflagging, foolproof