'bloomless' originates from Modern English, combining the word 'bloom' (from Middle English 'blome', originally meaning 'flower' or 'blossom') and the suffix '-less' (from Old English 'lēas'), where '-less' meant 'without'.

'bloom' developed from Old English/Middle English forms such as 'blōma'/'blome' and became 'bloom' in modern English; the suffix '-less' comes from Old English 'lēas' and has been used in English to form adjectives meaning 'without' since Old English, producing compounds like 'bloomless'.

Initially it meant 'without flowers' in a literal botanical sense; over time it has retained that core meaning but can also be used figuratively to mean 'lacking freshness or attractiveness'.