'hastily-organized' originates from English, specifically the combination of the adverb 'hastily' (from 'hasty') and the past participle 'organized' (from 'organize').

'hasty' came into English via Middle English from Old French (e.g. 'hastif'), ultimately related to notions of 'haste'; 'organize' comes from French 'organiser' and Medieval Latin 'organizare', from Greek 'organon' meaning 'tool, instrument', and developed into English 'organize' with the sense 'to arrange' and then past participle 'organized'.

Initially, elements meant 'done with haste' ('hasty') and 'to form into an orderly structure' ('organize'); combined, the phrase has come to mean 'formed or arranged quickly, often with insufficient planning or care.'