Adjective
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unpredictably difficult in operation
likely to be troublesome
"rockets were much too fractious to be tested near thickly populated areas"
"fractious components of a communication system"
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easily irritated or annoyed
"an incorrigibly fractious young man"
"not the least nettlesome of his countrymen"
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stubbornly resistant to authority or control
"a fractious animal that would not submit to the harness"
"a refractory child"