1) Harmless 2) Having no adverse effect 3) Innocuous 1) Innocuous 
harmless
• (a.) Free from crime; pure; innocent. • (a.) Free from hurtful qualities or effects; harmless.
Synonym: innocuous. ... Origin: L. In-noxius, fr. In, neg. + noceo, to injure ... (05 Mar 2000) ... 
In·nox'ious adjective [ Latin innoxius . See In- not, and Noxious .] 1. Free from hurtful qualities or effects; harmless. ' Innoxious flames.' Sir K. Digby. 2. Free from crime; pure; innocent. Pope. -- In*nox`ious*ly , 
Type: Term Pronunciation: i-nok′shŭs Synonyms: innocuous
[adj] - having no adverse effect
innoxious 1. Free from mischievous qualities; innocent; harmless; as an innoxious drug. 2. Not producing evil; harmless in effects; not injurious. 3. Free from crime; pure; innocent.
adjective having no adverse effect
harmless; innocuous.