I wonder if these two sentences are equivalent:
I was completely fool.
I was a complete fool.
If no, let me know the difference and if they're incorrect, please change the sentence, so I know how the correct sentences should be. Thanks.
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I have never seen or heard 'I was completely fool." I believe it is simply wrong. "Fool" is rarely used as an adjective. Merriam Webster gives an example: "barking its fool head off". https://www.merriam-webster.com/dictionary/fool But I think that is an unusual case.
If I wanted an adjective I would say "foolhardy" or "foolish".
If you wanted to talk about something that happened, you might say, "I was completely fooled." In that case "fooled" is a verb.