Collocations for indifferent - adj.

appear, be, feel, seem, sound
He appeared indifferent to her suffering.

act (esp. AmE)
Alice tried to act indifferent about the incident.

become
remain

completely, quite, supremely, totally, utterly
almost
Pat sounded almost indifferent.

largely, relatively
apparently, seemingly

about
Most staff were indifferent about the plans.

to
He was coldly indifferent to other people.

be

very (esp. BrE)
We enjoyed the day, in spite of very indifferent weather.

rather
a rather indifferent performance

good, bad and/or indifferent
The festival has the usual mix of movies—good, bad and indifferent.

Indifferent is used with these nouns:
shrug