Origin: 1400–50;late Middle English, variant of indifferency < Latinindifferentia. See indifferent, -ence, -ency
Synonyms 1. Indifference, unconcern, listlessness, apathy, insensibility all imply lack of feeling. Indifference denotes an absence of feeling or interest; unconcern an absence of concern or solicitude, a calm or cool indifference in the face of what might be expected to cause uneasiness or apprehension; listlessness an absence of inclination or interest, a languid indifference to what is going on about one; apathy a profound intellectual and emotional indifference suggestive of faculties either naturally sluggish or dulled by emotional disturbance, mental illness, or prolonged sickness; insensibility an absence of capacity for feeling or of susceptibility to emotional influences.