The term 'with ardor' is used to describe someone who is passionate and enthusiastic about something. The crossword solutions for this term are 'HOTLY' (5 letters), 'MADLY' (5 letters), 'warmly' (6 letters), 'EARNESTLY' (9 letters), and 'glowingly' (9 letters). All of these words imply that the person is doing something with great enthusiasm and energy. They also suggest that the person is doing it with a positive attitude, as 'HOTLY' and 'MADLY' imply intensity, while 'warmly' and 'glowingly' imply a more pleasant feeling. 'EARNESTLY' implies that the person is doing something with sincerity and seriousness.