In the context: describing someone's personal behaviours and showing them to others.
He is a selfish and suspectful/doubtful person.
He has selfishness, and doubtful thoughts(think of others)
Are these sentences correct? and let me have your suggestions on these differences - "is" and "has"
"He is a selfish person" is fine. We do not say "He has selfishness". "suspectful" is not a word, and "doubtful" is hard to understand in your sentences.
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"He is a selfish person" is fine. We do not say "He has selfishness".
"suspectful" is not a word, and "doubtful" is hard to understand in your sentences. If you mean that he shows suspicion towards other people (e.g. doesn't trust other people), you can say "He is a selfish and suspicious person", or of course just "He is selfish and suspicious".