clandestinely

As adverbs the difference between stealthily and clandestinely

is that stealthily is in a stealthy manner, furtively while clandestinely is in a secret or covert manner.

As adverbs the difference between clandestinely and secretly

is that clandestinely is in a secret or covert manner while secretly is in secret, covertly.

As an adjective insidious

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

As an adverb clandestinely is

in a secret or covert manner.

As a noun book

is a collection of sheets of paper bound together to hinge at one edge, containing printed or written material, pictures, etc.

As a verb book

is to reserve (something) for future use.

As an adverb clandestinely is

in a secret or covert manner.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adverb clandestinely is

in a secret or covert manner.