secure

adjective

Free from danger or attack.

adjective

Free from risk of loss; safe.

adjective

Free from the risk of being intercepted or listened to by unauthorized persons.

adjective

Free from fear, anxiety, or doubt.

adjective

Not likely to fail or give way; stable.

adjective

Firmly fastened.

adjective

Reliable; dependable.

adjective

Assured; certain.

adjective

Careless or overconfident.