The following might be useful for making things slightly more precise. When people say "you just feel it" or "it's obvious," they're saying that qualia are primitives. Primitives, by definition, cannot be decomposed into simpler parts. Every explanation is a breaking down of things into simpler parts. So qualia are claimed to be ineffable. For this reason, many people think that trying to explain qualia is like trying to explain how to move your arm—you either get it or you don't.
The following might be useful for making things slightly more precise. When people say "you just feel it" or "it's obvious," they're saying that qualia are primitives. Primitives, by definition, cannot be decomposed into simpler parts. Every explanation is a breaking down of things into simpler parts. So qualia are claimed to be ineffable. For this reason, many people think that trying to explain qualia is like trying to explain how to move your arm—you either get it or you don't.