Answer: fervent

AnswerCrossword Clue
FERVENTHeartfelt
FERVENTGlowing.
FERVENTArdent.
FERVENTImpassioned
ferventhaving or showing great warmth or intensity of spirit, feeling, enthusiasm, etc.
ferventzealous (filled with zeal)
ferventhaving or showing intensity of feeling; ardent