'constantly-reviewed' originates from English compounding: the adverb 'constantly' (from Latin 'constare,' “to stand together; be firm; constant”) + the past participle 'reviewed' of 'review' (from Old French 'reveu/reveue' and ultimately Latin 'videre,' “to see,” via 're-' “again” + 'view' < Old French 'veue').

'review' entered English via Middle French 'revue'/Old French 'reveu' (“a viewing again; inspection”). The modern compound adjective 'constantly-reviewed' arose in contemporary English by combining the adverb with the participial adjective 'reviewed,' especially in formal and technical registers.

Initially, 'review' meant “to see again; to inspect.” In modern usage, 'constantly-reviewed' emphasizes the ongoing, repeated nature of that inspection or evaluation.