ardent : (adj.) uttatta; ātāpī; pahitatta; ussuka.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

nan tan

[translation-san] {C} pratipatti

[translation-eng] {Hopkins} earnest; ardent

[translation-eng] {C} progressive path; progress to

Jeffrey Hopkins' Tibetan-Sanskrit-English Dictionary