risk-free

certain clear dependable harmless healthy pure reliable secure

innocent sound

checked competent decontaminated innocuous innoxious inoffensive neutralized nonpoisonous nontoxic riskless tame tried-and-true trustworthy uninjurious unpolluted wholesome

indefinite irresponsible uncertain undecided unfixed unreliable unsure

dangerous exposed harmful incautious poisonous risky unguarded unprotected unsafe unthoughtful vulnerable