tepid (adj.)

• aestival
• apathetic
• arid
• blase
• cold
• colorless
• cool
• dim
• dull
• equatorial
• faint
• feeble
• forceless
• genial
• halfhearted
• indifferent
• lifeless
• lukewarm
• mild
• neuter
• neutral
• nonchalant
• perfunctory
• sapless
• spiritless
• subtropical
• summery
• sunny
• temperate
• thermal
• thermic
• tropical
• uncaring
• unconcerned
• unenthusiastic
• unfrozen
• uninterested
• warm
• weak