Earnest (7)
'earnest' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for fervent that I've seen before include "Zealous" , "Impassioned" , "Hot" , "Enthusiastic" , "Intensely passionate" .)
'earnest' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for serious that I've seen before include "Important -- grave" , "Earnest, sincere" , "Stern" , "Earnest; vital" , "Not light or frivolous" .)
'earnest' is the definition.
(sincere means earnest or genuine)
This is all the clue.
(Other definitions for sincere that I've seen before include "natural?" , "True" , "Pure" , "Earnest" , "Free from deception" .)
'earnest' is the definition.
(I know that earnest can be written as solemn)
This is all the clue.
(Other definitions for solemn that I've seen before include "Serious; deeply sincere" , "Serious and humourless" , "Sober and serious" , "'Earnest, grave (6)'" , "pious" .)