INDIFFERENCE
Disregard Apathy
It is not worth a moment’s regard
Let “by-gones” be “by-gones”
It is a matter of no importance
Cast it to the winds
What is past shall go for nothing
Of it I really make no account
Let it pass
Quite apathetic
The exceptions are so few as to be negligible
Extremely trivial
In one ear and out at the other
The edge of my inclination is much taken off
A half-hearted interest at best