Performed or happening in secret. / Employed or engaged in spying or secret investigation.

A person who works undercover.

To provide too little coverage.

plural of undercover

Third-person singular simple present indicative form of undercover

Insufficiently covered (against risk) / Having too little coverage.

simple past tense and past participle of undercover

plural of undercovering

A covering that goes under something else.

present participle of undercover