'blossomless' originates from Modern English, formed from the noun 'blossom' (Old English 'blostma' / 'blōstm') and the suffix '-less' (Old English 'lēas'), where 'blostma' meant 'a flower/blossom' and 'lēas' meant 'without'.

'blossom' changed from Old English 'blostma'/'blōstm' to Middle English 'blosme' and eventually to modern English 'blossom'; the suffix '-less' came from Old English 'lēas', passed into Middle English as '-les', and combined with nouns to form adjectives meaning 'without'.

Initially it meant 'without blossoms' (literally), but over time it has also been used figuratively to mean 'lacking beauty, vitality, or signs of growth'.