Not taught

NATURAL

Think of something that occurs without human instruction or intervention, like an instinct or untrained ability.

"Natural" fits "not taught" because it describes something innate or instinctive—like talent or behavior that isn’t learned. The wordplay is straightforward: "natural" literally means occurring without instruction or training. Think of phrases like "a natural athlete" or "natural ability," where the skill comes effortlessly rather than from lessons. It’s a direct definition clue with no hidden tricks.