unsubstantiated

Therearenumerousunsubstantiatedreportsthatnaturalvitaminsaresuperiortosyntheticones,thatfertilizedeggsarenutritionallysuperiortounfertilizedeggs,thatuntreatedgrainsarebetterthanfumigatedgrains,andthelike.

Theword“unsubstantiated”isclosestinmeaningtowhichoffollowing?

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