Possible Clues:

• Indifferent
• The warm little dear would come back before I would
• Return of bad mood with part of one's mind lacking enthusiasm
• Of liquid, luke-warm
• Rising quietly in assembly without enthusiasm
• So-so
• Perfunctory
• All-round diet includes source of protein -- not enthusiastic!
• Turns up, gym in old college is not so hot
• Cool piano in new edit