1. Serving to support or corroborate
   - collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, validating, validatory, verificatory, verifying

See also: substantiate, supportive

• unasterisked
• unattached
• unattackable
• unattainable
• unattainableness
• unattainably
• unattended
• unattentive
• unattired
• unattractive
• unattractively
• unattractiveness
• unattributable
• unau
• unauthentic
• unauthorised
• unauthorised absence
• unauthorized
• unauthorized absence
• unavailability
• unavailable
• unavailing
• unavenged
• unavoidability
• unavoidable