Antonym: concern, interest. Similar words: indifferent, difference, make a difference, different, differentiate, reference, inference, deference. Meaning: [ɪn'dɪfrəns] 
n. 1. unbiased impartial unconcern 2. apathy demonstrated by an absence of emotional reactions 3. the trait of lacking enthusiasm for or interest in things generally 4. the trait of remaining calm and seeming not to care; a casual lack of concern.
n. 1. unbiased impartial unconcern 2. apathy demonstrated by an absence of emotional reactions 3. the trait of lacking enthusiasm for or interest in things generally 4. the trait of remaining calm and seeming not to care; a casual lack of concern. 
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31. Her apparent indifference made him even more nervous.
32. I was disappointed by his indifference more than somewhat.
33. She had developed a shell of indifference.
34. Her recent indifference to her work is all of a piece with her troubled mental state.
35. The more recent members of staff regard the change in corporate culture with a certain indifference.
36. He turned away from her slightly to signify his indifference.
37. Andy assumed an air of indifference whenever her name was mentioned.
38. Whether you stay or leave is a matter of total indifference to me .
39. Many native speakers of a language show indifference to/towards grammatical points.
40. He assumed a look of indifference but I knew how he felt.
41. The president is resigned to public indifference to his latest initiative.
42. It's a matter of indifference to me whether he goes or not.
43. What she said is a matter of complete indifference to me.
44. He displayed a sublime indifference to the distinction between right and wrong.
45. Constable's landscapes met with indifference when they were first exhibited.
46. Nesterenko is trying to end that isolation and indifference.
47. That silence has nothing to do with indifference.
48. America has a history of indifference to racial discrimination.
49. She walked with total indifference to what she saw.
50. The most destructive criticism is indifference. Edgar Watson Howe 
51. So their public indifference only came across as denial.
52. They fought incompetence, inclement weather and indifference.
53. The woman, with supreme indifference, plodded on.
54. It was heads in air, studied indifference.
55. Or is it just plain indifference?
56. Consider an indifference curve in space.Sentence dictionary
57. The only thing she could do was to assume an air of indifference.
58. He seem bored now; and he blinked at Mitchell with imperious indifference.
59. Despite the continued indifference of the Labour Party the Communists had made many concessions aimed at attracting support from Labour members.
60. Sub-prefect Anselm received the cheers with the complaisant indifference of a soldier and a nobleman.
More similar words: indifferent, difference, make a difference, different, differentiate, reference, inference, deference, conference, preference, differ, interference, differ from, coherence, reverence, irreverence, deferential, serendipity, preferential, deferentially, occurrence, indulgence, independence, diffident, difficult, declaration of independence, offer, duffer, buffer, offering.