profound

A profound idea or feeling is one that's very deep and meaningful.

When people talk about something being profound, they usually mean it's not just on the surface – it's a really big deal. For example, if someone says "I had a profoundly moving experience at the museum," they're saying that seeing an exhibit was incredibly emotional for them, like it touched their heart in a deep way. Or, if a book is described as profound, it means its ideas and messages are complex and thought-provoking, not something you can quickly skim over. You'll often see "profound" used with words like "impact", "change", or "insight" to describe how an experience or a piece of writing has affected someone deeply.