Italian word ritenuto comes from Italian ritenere

Detailed word origin of ritenuto

Dictionary entry	Language	Definition
ritenere	Italian (ita)	(transitive) to hold back, hold down, hold, stop, retain. (transitive) to think, believe, reckon, consider.
ritenuto	Italian (ita)	(rare) reserved, circumspect, cautious Past participle of ritenere.