harmless
adj.adj. not able to hurt anyone or cause any damage. You use this to describe things that are safe and not dangerous.
adj. incapable of causing injury, damage, or distress. Often used to reassure that a perceived threat is actually benign.
Don't worry, that little spider is completely harmless.
The doctor explained that the side effects of the medication are usually harmless and disappear within a few hours.
While the initial software glitch appeared harmless, it eventually revealed a deeper systemic vulnerability that required a complete overhaul of the security protocols.
From Middle English harmles, from Old English hearmlēas, from Proto-Germanic harmalausaz (“without harm; harmless”), equivalent to harm + -less. Cognate with German harmlos (“harmless”), Danish harmløs (“harlmess”), Swedish harmlös (“harmless”).
Typically used as an attributive adjective before a noun or as a predicative adjective after a linking verb like 'be' or 'seem'.