'awesomely' originates from Modern English, formed by adding the adverbial suffix '-ly' to the adjective 'awesome', where 'awesome' was formed from 'awe' + the suffix '-some' meaning 'characterized by' or 'causing'.

'awe' in Old English appeared as 'ege' (and related Old Norse 'agi') meaning 'terror, dread'; it evolved into Middle English 'awe' meaning 'reverential fear' and in the late 16th century the adjective 'awesome' ('causing awe') was coined; 'awesomely' later arose by adding '-ly'.

Initially, 'awesome' and related forms meant 'causing awe' often with fear or reverence; over time the sense shifted in colloquial use toward 'extremely good' or 'impressive' and 'awesomely' is frequently used as a positive intensifier.