disinterest

noun
1
lack of interest
بی‌علاقگی, عدم علاقه, فقدان علاقه
2
the fact of not being involved in something and therefore able to be fair
بی‌طرفی, بی‌غرضی, عدم طرفداری, عدم دخالت
She makes all her judgements with scientific disinterest.