'dauntfulness' originates from Modern English, specifically the word 'dauntful' combined with the suffix '-ness' to form a noun meaning 'the state or quality of being dauntful'.

'dauntful' was formed from the verb 'daunt' + suffix '-ful'. 'Daunt' comes from Middle English 'daunten' (or 'dauntenen'), from Old French 'danter' meaning 'to tame or subdue', ultimately traceable to Latin roots related to 'domare' (to tame). Over time these forms evolved into the modern English 'daunt' and derived nouns like 'dauntfulness'.

Initially related to taming or subduing (in the sense of overpowering), the sense shifted toward intimidating or discouraging; today 'dauntfulness' denotes the quality of causing intimidation or awe.