secretly

As adverbs the difference between secretly and overtly

is that secretly is in secret, covertly while overtly is in an overt manner; publicly; openly.

As an adjective confidential

is (meant to be) kept secret within a certain circle of persons; not intended to be known publicly.

As an adverb secretly is

in secret, covertly.

As adverbs the difference between aggressively and secretly

is that aggressively is in an aggressive manner while secretly is in secret, covertly.

As adverbs the difference between secretly and slyly

is that secretly is in secret, covertly while slyly is (label) dexterously, skilfully.

As an adjective secretive

is having an inclination to secrecy.

As an adverb secretly is

in secret, covertly.

As adverbs the difference between secretly and stealthily

is that secretly is in secret, covertly while stealthily is in a stealthy manner, furtively.

As adverbs the difference between secretly and inwardly

is that secretly is in secret, covertly while inwardly is in an inward manner; on the inside or to one's self.

As a noun stealth

is (uncountable) the attribute or characteristic of acting in secrecy, or in such a way that the actions are unnoticed or difficult to detect by others.

As an adverb secretly is

in secret, covertly.

As a noun silence

is the lack of any sound.

As a verb silence

is to make (someone or something) silent.

As an interjection silence

is a common imperative instructing the addressed to remain silent.

As an adverb secretly is

in secret, covertly.

As an adjective clandestine

is done or kept in secret, sometimes to conceal an illicit or improper purpose.

As an adverb secretly is

in secret, covertly.