1. Showing no care or concern in attitude or action
   "indifferent to the sufferings of others"; "indifferent to her plea"
    
2. Marked by a lack of interest
   "the universe is neither hostile nor friendly; it is simply indifferent";
   - apathetic
    
3. (usually followed by ‘to’) unwilling or refusing to pay heed
   "indifferent to her warnings";
   - deaf
    
4. Marked by no especial liking, dislike or preference for one thing over another
   "indifferent about which book you would give them"; "was indifferent to their acceptance or rejection of her invitation"
    
5. Characterized by a lack of partiality
   "a properly indifferent jury";
   - unbiased, unbiassed [rare]
    
6. (often followed by ‘to’) lacking importance; not mattering one way or the other
   "whether you choose to do it or not is a matter that is quite indifferent"; "what others think is altogether indifferent to him";
   - immaterial
    
7. Being neither good nor bad
   "an indifferent performance"; "a gifted painter but an indifferent actor";
   - so-so
    
8. Neither too great nor too little
   "a couple of indifferent hills to climb"
    
9. Fairly poor to not very good
   "has an indifferent singing voice"; "has indifferent qualifications for the job"
    
10. (chemistry) having only a limited ability to react chemically; chemically inactive
    "an indifferent chemical in a reaction";
    - inert, neutral

See also: heedless, impartial, inferior, moderate, ordinary, unconcerned, unheeding, unimportant, uninterested, unreactive

Encyclopedia: Indifferent