'sluggishly-developed' originates from the combination of 'sluggishly' and 'developed'. 'Sluggishly' comes from 'sluggish', which originates from Middle English 'slugge', meaning 'lazy'. 'Developed' comes from Old French 'desveloper', meaning 'to unwrap'.

'Sluggishly' changed from the Middle English word 'slugge' and eventually became the modern English word 'sluggishly'. 'Developed' evolved from the Old French 'desveloper' to the modern English 'developed'.

Initially, 'sluggish' meant 'lazy or slow-moving', and 'developed' meant 'to unwrap or unfold'. Over time, 'sluggishly-developed' came to mean 'developed at a slow pace'.