uncharacteristic

/ʌnˌkɛrəktəˈrɪstɪk/
adjective
  1. Not typical of a particular person, thing, or group; unusual or unexpected given what is known.
    • It was uncharacteristic of him to arrive late; he was usually very punctual.
    • The sudden silence from the usually noisy classroom was uncharacteristic.
    • Her uncharacteristic outburst surprised everyone who knew her calm nature.
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