intelligent

Describes a capacity for mental processing that goes beyond mere knowledge. It implies an active ability to reason, adapt, and solve problems efficiently. While 'smart' is often used casually to describe quick wit or practical cleverness, 'intelligent' carries a more formal and stable connotation. It suggests an innate cognitive power or a sophisticated level of intellectual development. When applied to animals or non-humans, it refers to a perceived depth of understanding or awareness, often signaled by behavior that mimics human reasoning.