Adequate means enough to meet a requirement or serve a purpose, but nothing more than that. If you study an adequate amount for a test, you'll probably pass, but you won't ace it. If a tent provides adequate shelter from rain, it keeps you dry but might not be particularly comfortable.

The word sits in an interesting middle ground. Something adequate gets the job done without being impressive. When a coach says your effort was adequate, they mean you did what was minimally necessary, not that you excelled. A student who submits adequate work meets the basic expectations but doesn't go beyond them.

Sometimes adequate is exactly what you need: adequate food and water will keep you healthy and strong. But in other situations, adequate feels disappointing. If a friend describes your birthday present as adequate, you'd probably feel let down, even though technically they're saying it was good enough.

When you're checking whether something is adequate, you're asking: does this measure up to the minimum standard? An adequate answer on a homework question earns full credit. An adequate amount of sleep helps you function the next day. In both cases, you got what you needed, even if there's room for more.