lush

The word 'lush' has a somewhat obscure origin, likely emerging in late Middle English. It is thought to be an alteration of the Old French word 'lasche' or 'lache', meaning 'lax' or 'slack', which itself derives from the Latin 'laxus' (meaning 'loose'). The semantic journey from 'loose' or 'slack' to the modern meaning is intriguing. One strong theory suggests it evolved through the idea of being 'lax' or 'soft' to the touch, which was then applied to describe soft, tender, and abundant plant growth. Another path connects it to a potential but unverified link with 'luxuriant'. By the 17th century, 'lush' was firmly established in English to describe rich, abundant, and thriving vegetation, later extending to describe luxurious and opulent comfort.

The word 'lush' is a simplex word. It is not productively formed from smaller, recognizable morphemes within modern English spelling. Its core form is the entire word.