harmless

Plain is a related term of harmless.

As adjectives the difference between plain and harmless

is that plain is while harmless is incapable of causing harm or danger.

As an adverb plain

is (colloquial) simply.

As a noun plain

is (rare|poetic) a lamentation or plain can be an expanse of land with relatively low relief.

As a verb plain

is to lament, bewail or plain can be (obsolete|transitive) to plane or level; to make plain or even on the surface.

As adjectives the difference between harmless and unaffected

is that harmless is incapable of causing harm or danger while unaffected is not affected or changed.

As a noun unaffected is

someone not affected, as by a disease.

As adjectives the difference between harmless and credulous

is that harmless is incapable of causing harm or danger while credulous is excessively ready to believe things; gullible.

Harmless is a related term of guiltless.

As adjectives the difference between harmless and guiltless

is that harmless is incapable of causing harm or danger while guiltless is free from guilt; innocent.

Mere is a related term of harmless.

As a noun mere

is fear, awe.

As an adjective harmless is

incapable of causing harm or danger.

Mild is a related term of harmless.

As adjectives the difference between mild and harmless

is that mild is gentle and not easily provoked while harmless is incapable of causing harm or danger.

As a noun mild

is (british) a relatively low-gravity beer, often with a dark colour; mild ale.

As adjectives the difference between harmless and benevolent

is that harmless is incapable of causing harm or danger while benevolent is having a disposition to do good.

Harmless is a related term of innoxious.

As adjectives the difference between harmless and innoxious

is that harmless is incapable of causing harm or danger while innoxious is having no harmful effect.

Harmless is a related term of inartificial.

As adjectives the difference between harmless and inartificial

is that harmless is incapable of causing harm or danger while inartificial is not artificial; natural; simple; artless.

Harmless is a synonym of unoffending.

As adjectives the difference between harmless and unoffending

is that harmless is incapable of causing harm or danger while unoffending is not offending.