insidious

Secret is a related term of insidious.

As adjectives the difference between secret and insidious

is that secret is being or kept hidden while insidious is producing harm in a stealthy, often gradual, manner.

As a noun secret

is (countable|uncountable) knowledge that is hidden and intended to be kept hidden.

As a verb secret

is to make or keep secret.

As adjectives the difference between insidious and evil

is that insidious is producing harm in a stealthy, often gradual, manner while evil is intending to harm; malevolent.

As a noun evil is

moral badness; wickedness; malevolence; the forces or behaviors that are the opposite or enemy of good.

As an adjective insidious

is producing harm in a stealthy, often gradual, manner.

As a noun incipit is

the first few words of a text, especially its first line.

As adjectives the difference between insidious and diabolical

is that insidious is producing harm in a stealthy, often gradual, manner while diabolical is extremely wicked or cruel.

As adjectives the difference between destructive and insidious

is that destructive is causing destruction; damaging while insidious is producing harm in a stealthy, often gradual, manner.

As adjectives the difference between insidious and iniquitous

is that insidious is producing harm in a stealthy, often gradual, manner while iniquitous is wicked or sinful.

As an adjective insidious

is producing harm in a stealthy, often gradual, manner.

As a noun abduction is

leading away; a carrying away .

As an adjective insidious

is producing harm in a stealthy, often gradual, manner.

As a noun resonation is

the act or state of resonating.

As adjectives the difference between intrepid and insidious

is that intrepid is fearless; bold; brave while insidious is producing harm in a stealthy, often gradual, manner.

As a proper noun serpentine

is the lake in hyde park, london or serpentine can be a name given to several rivers in alaska, australia, canada and new zealand .

As an adjective insidious is

producing harm in a stealthy, often gradual, manner.