'off-puttingly' originates from English, specifically the adjective 'off-putting', where 'off-' meant 'away' and 'put' (from Middle English 'putten') meant 'to place'.

'off-putting' developed from the phrasal verb 'put off' (Middle English 'putten off'), the adjective form 'off-putting' arose to mean 'causing one to be put off', and the adverb 'off-puttingly' was formed later by adding the suffix '-ly'.

Initially related to physically placing something away or postponing (as in 'to put off'), the expression shifted to describe causing aversion or discomfort, which is its primary sense today.