unconcerned (adj.)
- aloof
- apathetic
- ataractic
- benumbed
- blase
- bored
- careless
- casual
- collected
- comatose
- composed
- cool
- degage
- detached
- devil-may-care
- disinterested
- dispassionate
- distant
- dull
- easy
- easygoing
- heartless
- heedless
- hopeless
- impassive
- inattentive
- incurious
- indifferent
- insouciant
- lackadaisical
- languid
- lethargic
- listless
- mindless
- negligent
- nonchalant
- numb
- numbed
- offhand
- passive
- perfunctory
- phlegmatic
- reckless
- regardless
- remote
- slack
- sluggish
- soporific
- spiritless
- stoic
- stolid
- stupefied
- supine
- torpid
- uncaring
- undiscriminating
- uninquiring
- uninterested
- uninvolved
- unmindful
- withdrawn
