Qualified means having the skills, knowledge, or credentials needed to do something well. A qualified teacher has completed the required training and earned the necessary certificates to teach in a classroom. A qualified pilot has logged enough flight hours and passed all the tests to safely fly passengers. When you're qualified for something, you've proven you can handle it.

The word also describes something that is limited or modified by conditions. When someone gives a qualified yes to a question, they're saying “yes, but...” with some restrictions attached. If a scientist offers qualified support for a theory, she agrees with parts of it but has reservations about other aspects. A qualified statement isn't an absolute one: it includes exceptions, conditions, or careful limitations that make it more accurate but less sweeping.

To qualify means to meet the requirements for something. You might qualify for the spelling bee finals by scoring high enough in the preliminary rounds. Athletes qualify for the Olympics by meeting strict performance standards. You can also qualify a statement by adding details that narrow or clarify what you mean, turning a broad claim into something more precise and defensible.