rainless

the adjective 'rainless' is a transparent modern english compound formed by combining the noun 'rain' with the suffix '-less'. the old english root 'regn' is shared across germanic languages, ultimately deriving from the proto-indo-european root reg- meaning 'moist, wet'. the suffix '-less' originates from the old english adjective 'lēas', meaning 'devoid of', which evolved from a noun meaning 'falsehood' or 'loss'. the logical construction is direct: 'rain' + '-less' (without) yields the meaning 'without rain', describing a condition or period devoid of precipitation. this pattern of attaching '-less' to a noun to denote absence is highly productive in english.

Structure: rain (water falling in drops from clouds) + less (without) rain: from old english 'regn' (rain, shower), of proto-germanic origin, functioning as the core noun element. less: from old english '-lēas' (devoid of, free from), a suffix forming adjectives, of proto-germanic origin.