Insipid
Part of speech: adjective
Definition: Unappetizingly flavorless. Flat; lacking character or definition. Cloyingly sweet or sentimental.
Example sentence: Taste, which enables us to distinguish all that has a flavor from that which is insipid.
Innocuous
Part of speech: adjective
Definition: Harmless; producing no ill effect; innocent.Inoffensive; unprovocative; not exceptional.