'feebly-grown' originates from the combination of 'feeble' and 'grown', where 'feeble' comes from Old French 'feble', meaning 'weak', and 'grown' is the past participle of 'grow', from Old English 'grōwan'.

'feeble' changed from Old French 'feble' to Middle English 'feeble', and 'grown' evolved from Old English 'grōwan' to its modern form.

Initially, 'feeble' meant 'weak or lacking strength', and 'grown' referred to the process of growth. Together, they describe something that has grown weakly.