- aff. an adjective-forming suffix meaning “without,”“not having” that specified by the noun base (careless; shameless); added to verbs, it is equivalent to “un-” plus the present participle of the verb, or “un-” plus the verb plus “-able” (quenchless; tireless)•Etymology: ME -les, OE -lēas, suffixal use of lēas free from, without, false, c. OOHGlōs, ON lauss; cf. loose
From formal English to slang. 2014.