Etymology
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innocuous (adj.)

"harmless, producing no ill effect, incapable of harm or mischief," 

1590s, from Latin innocuus "harmless; innocent; inoffensive," from in- "not" (see in- (1)) + nocuus "hurtful," from root of nocere "to injure, harm," from *nok-s-, suffixed form of PIE root *nek- (1) "death." Related: Innocuously; innocuousness.

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Definitions of innocuous

innocuous (adj.)
not injurious to physical or mental health;
innocuous (adj.)
not causing disapproval;
it was an innocuous remark
confined himself to innocuous generalities
Synonyms: unobjectionable
innocuous (adj.)
lacking intent or capacity to injure;
Synonyms: innocent
From wordnet.princeton.edu