English

interestless

From interest + -less.

Formed from interest + -less

Proto-Indo-European *h₁es- ‘to be’

…

Latin intersum ‘to be between; to concern’

Medieval Latin intersum ‘to concern’

Old French interesse

Middle English interest

Today it means

adj Without interest.

Language periods are conventional ranges, not dates for this word.

Etymograph / interestless