without the power or desire to do harm; innocuous

He looks mean but he's harmless; a harmless Halloween prank.

without injury; unhurt; unharmed. ?

hold harmless, Law . to relieve from responsibility or liability for any damage or loss. Also

save harmless.

adjective

bad , destructive , evil , harmful , hurtful , injurious , sinful , wicked

adjective

controllable , disarmed , gentle , guiltless , hurtless , innocent , innocuous , innoxious , inoffensive , inoperative , kind , manageable , naive , nonirritating , nontoxic , painless , paper-tiger , powerless , pussycat , reliable , safe , sanitary , simple , soft * , softie , sound , sure , trustworthy , unobjectionable , unoffensive , blameless , faultless , irreproachable , lily-white , unblamable , benign , peaceable , pure , uninjured , unscathed