'outgoingly' originates from English, specifically from the adjective 'outgoing' plus the adverbial suffix '-ly', where the suffix '-ly' meant 'in the manner of'.

'outgoing' changed from Middle English 'out-going' (a compound of 'out' + 'going'), and ultimately derives from Old English elements 'ūt' ("out") and 'gān' ("to go"); the adjective developed into modern English 'outgoing' and the adverb formed as 'outgoing' + '-ly'.

Initially it referred to 'going out' or 'moving outward'; over time the adjective acquired the figurative sense 'sociable' (one who 'goes out' socially), and 'outgoingly' now means 'in a sociable manner'.