Indifference is generally defined as a lack of interest or concern. But the degree of it depends on the situation and the circumstances.
Indifference to untidiness of our work station is not the same as indifference to an act of evil or wickedness.
In the 1st reading, the mother of Moses could just be indifferent and lamented that God was not protecting His people by letting the Egyptians kill their baby boys.
But she did something to protect her baby from the impending evil.
Similarly the adult Moses did not look away or was indifferent to the violence an Egyptian inflicted on his countryman.
In the gospel, Jesus made a pointed reproach on the indifference of the towns of Chorazin and Bethsaida and Capernaum.
Indifference is a sign of internal decay and as such the three cities mentioned in gospel are now in ruins.
Indifference is also a sign that our faith is decaying and that we are not sensitive to the promptings of God in our hearts.
May our hearts be softened by God’s love and may we be aware of the needs of others around us.
“All that is necessary for the triumph of evil is that good men do nothing.” (Edmund Burke)
Commentary by Father Stephen Yim
The Concho Padre
THE CONCHO PADRE POST 
Commentary on Scripture for Wednesday of the 15th Week in Ordinary Time
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“You have hidden these things from the wise and the learned and have revealed them to the childlike”
My daughters, if only you knew the delight God takes in seeing a poor village girl, a poor [religious] Daughter of Charity speak to him lovingly, oh!, you would walk with even greater confidence than I could advise you. If you knew how much science you would draw from it, how much love and sweetness you would find in it! There you would find it all, dear daughters, because it is the fountain and spring of all knowledge.
Where does it come from that you see unlettered people speak so fluently about God and explain mysteries with more understanding that would a doctor? A doctor who has no more than his doctrine really speaks about God according to the manner his knowledge has taught him; but a prayerful person speaks in an altogether different way. And the difference between them comes, my daughters, from the fact that the first speaks out of a knowledge that is simply acquired, but the other from an infused knowledge full of love, in such a way that the doctor in this comparison is by no means the more knowledgeable. And he is obliged to keep quiet wherever a person of prayer is present because she speaks of God in a very different way than he is able to do.
Saint Vincent de Paul