unendly adjective 1adverb 1forms 2 adjective1 •(nonstandard, rare) Having no end; infinite; endless; unending.[…] An unendly repetitive transformation from which the process or system is not anymore able to escape. — 2012 adverb1 •(nonstandard, rare) In an unendly or infinite manner; infinitely; unendingly. formsmore unendly · most unendly