Opposite Word of unsupportive:
"supportive, accessory, adjunct, ancillary, adjuvant, appurtenant, auxiliary, accessary, accessory, certificatory, collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validator
"supportive, accessory, adjunct, ancillary, adjuvant, appurtenant, auxiliary, accessary, accessory, certificatory, collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validator