'unfeelingly' originates from the word 'unfeeling', which is derived from the prefix 'un-' meaning 'not' and the word 'feeling', which comes from Old English 'fēlan' meaning 'to touch or perceive'.

'unfeeling' evolved from the Old English word 'fēlan', which transformed into the Middle English 'felen', eventually becoming the modern English word 'feeling'. The prefix 'un-' was added to denote the absence of feeling.

Initially, 'feeling' meant 'to touch or perceive', but over time, 'unfeeling' evolved to mean 'lacking emotion or sympathy'.