'undemandingly' originates from English, built from the adjective 'undemanding' plus the adverbial suffix '-ly'. 'undemanding' itself is formed from the prefix 'un-' (not) + 'demanding' (from 'demand').

'undemandingly' was formed by adding the suffix '-ly' to 'undemanding'. 'Undemanding' developed from 'demanding' (adjectival use of 'demand') with the negating prefix 'un-'. 'Demand' comes from Middle English 'demanden' (from Old French 'demander') which in turn comes from Latin 'demandare'.

Initially, the root 'demand' in Latin carried senses of 'request' or 'entrust'; over time the English adjective 'demanding' came to mean 'requiring much' and 'undemanding' then came to mean 'not requiring much.' The adverb 'undemandingly' now means 'in a way that does not demand much.'