'keenly-developed' originates from the combination of 'keenly' and 'developed'. 'Keenly' comes from the Old English 'cēne', meaning 'brave' or 'wise', and 'developed' from the French 'développer', meaning 'to unfold'.

'Keenly' evolved from the Old English 'cēne' to the modern English 'keenly', while 'developed' transformed from the French 'développer' to the modern English 'developed'.

Initially, 'keenly' meant 'brave' or 'wise', but over time it evolved to mean 'intensely' or 'sharply'. 'Developed' has largely retained its meaning of 'unfolded' or 'advanced'.