11 letters · 14 points in Scrabble
adjective uninterrupted in time and indefinitely long continuing
originun- + remitting, from remit (in now rare sense of “diminish, abate”), from Middle English remitten, from Latin remittere (“to send, send back”). Compare Old French remettre, remetre, remitter. Not from nonexistent unremit. First attested in 1728.
Etymology from Wiktionary, CC BY-SA 3.0