I feel like I don't know any words?

Okay. So this past week, I have for some reason been looking up basic words for their meanings. I don't know why, I can use the word in a sentence, but I feel I don't know what it means. For instance that. I can use it in a sentence and read it. But I had to look up what it meant. I never had trouble with... show more Okay. So this past week, I have for some reason been looking up basic words for their meanings. I don't know why, I can use the word in a sentence, but I feel I don't know what it means. For instance that. I can use it in a sentence and read it. But I had to look up what it meant. I never had trouble with this before, and I feel stupid. Another example is the word feel. I know what it means, and I can read it just fine. But, I just feel like I really don't? (I am in high school FYI.)
Update: It's just I can't describe the word in a sentence.
2 answers 2