(n.) One governed by indifferentism.

Laodicean Olympian airy aloof apathetic average backward balking balky benumbed betwixt and between blah blase bored by-the-way callous careless casual centrist chill cold comatose commonplace cool cursory dead degage desensitized detached devil-may-care dilatory dilute diluted disinterested dispassionate disregardant disregardful distant distracted distrait dull easy easygoing emotionless equitable even evenhanded everyday fade fair fair to middling fairish fervorless fifty-fifty flat flavorless flippant forgetful free and easy frigid glacial grudging gruelly half-and-half halfhearted heartless hebetudinous heedless hopeless icy immaterial impartial impassive impersonal impotent imprecise in a stupor inadvertent inane inappreciable inattentive inconsequential inconsiderate incurious independent indevotional indevout indifferentist inferior inobservant insensible insensitive insignificant insipid insouciant intermediate jejune just lackadaisical lackluster laggard languid lax lazy lenient lethargic lightweight listless loath loose lukewarm mean mediocre medium middling midway mild milk-and-water mindless minor moderate modest namby-pamby negligent neuter neutral nonaligned nonchalant noncommitted nonobservant nonpartisan nonreligious not bad nugatory numb numbed objective oblivious of a kind of a sort of sorts offhand on the fence ordinary overindulgent overpermissive pappy passable passive perfunctory permissive phlegmatic pluckless pococurante poor pulpy reckless regardless relaxed reluctant remiss remote removed renitent resigned respectable respectless restive sapless savorless slack slight slipshod sloppy slow slow to sluggish so so so-so soft soporific spiceless spiritless spunkless stale stoic stolid stupefied supine tactless tasteless tedious tepid thin third-force third-world thoughtless tolerable torpid trifling trivial unbiased uncaring uncommitted uncompassionate unconcerned undazzled undevout undiplomatic undistinguished undutiful unemotional unenthusiastic unfeeling unflavored unheedful unheeding unimportant uninfluenced uninquiring uninspired uninterested uninvolved unjaundiced unmarking unmindful unnoticing unnoting unobservant unobserving unprejudiced unprepared unprepossessed unready unreligious unremarking unrestrained unsavory unsolicitous unswayed unsympathetic untactful unthinking unzealous vapid washy watered watered-down watery weak wishy-washy withdrawn zealless