adjective
having a crab-like or cross-grained quality; difficult or irritable in mood or behavior
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The professor's crabbed handwriting made it difficult for the students to read his notes.
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I can't read this crabbed handwriting, it's so messy!
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Why is your writing so crabbed? Can't you write more neatly?
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Her crabbed attitude towards new ideas hindered the team's progress.