C1 adjective /ʌnˈkwes.tʃən.ə.bl̩/
Unquestionable
議論の余地がない; 確実な
Meaning
not able to be disputed or doubted; certain and beyond doubt
Example
Her honesty and integrity are unquestionable qualities.
彼女の誠実さと誠意は議論の余地がない特性です。