'unboostable' originates from English, formed by the prefix 'un-' (from Old English 'un-' meaning 'not') + the verb 'boost' (a later English word from regional/dialect use meaning 'to raise or increase'), with the adjectival suffix '-able' indicating capability.

'boost' appeared in English in regional/dialect usage in the 18th century meaning 'to push up/raise'; later the product 'boost' gave rise to derived forms like 'boostable' and, more recently, the negated adjectival form 'unboostable'.

Initially formed simply to mean 'not able to be boosted' (negation of 'boostable'); this literal negative sense has remained stable, though its primary use is technical/jargon (e.g., gaming, systems) rather than general English.