'adverbless' originates from the English word 'adverb' combined with the suffix '-less', where 'adverb' refers to a part of speech that modifies verbs, adjectives, or other adverbs, and '-less' means 'without'.

'adverb' comes from the Latin word 'adverbium', and '-less' is a common English suffix indicating absence.

Initially, it meant 'without adverbs', and this meaning has remained consistent in modern usage.