She has zero (no countable) qualities of individual expression. -She is lacking is personal distinguishability, meaning, her reactions are indistinguishable from the rest. -She doesn't express any distinguishabilities such as a special quality of laughter, a personal.
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AnonymousShe has no personality. She lacks personality.It is not idiomatic - it means what the word says, according to this definition: the distinctive character of a person that makes him socially attractive.
AlpheccaStarsIt is not idiomaticInteresting. I would have said that the original sentences are idiomatic, meaning that they sound natural to a native speaker. You seem to have taken the question to mean: "Are these idioms?"