'unsensuous' originates from English, specifically formed from the prefix 'un-' and the adjective 'sensuous', where 'sensuous' ultimately comes from Latin 'sensus'/'sentire', meaning 'to feel'.

'sensuous' developed from Latin 'sensus' (from 'sentire', 'to feel') through Old French/Medieval Latin forms into Middle English as 'sensuous'; the negative form 'unsensuous' was created in English by adding the prefix 'un-' to that adjective.

The original Latin root meant 'to feel'; over time 'sensuous' came to mean 'pertaining to the senses' and 'unsensuous' came to mean 'not appealing to the senses' or 'lacking sensation'.