English
remitless
From remit + -less.
Formed from remit + -less
Latin mittō ‘to send, dispatch, cause to go, let go,…’
Latin remittō ‘to send, send back’
Middle English remitten ‘to remit, forgive’
English remit
Today it means
adj Without remit or letup.
Language periods are conventional ranges, not dates for this word.
Etymograph / remitless