IMPROB'ABLE, adjective [Latin improbabilis; in and probabilis, from probo, to prove.] Not likely to be true; not to be expected under the circumstances of the case. It is always improbable that men will knowingly oppose their own interest; yet the fact is possible. It is improbable that snow will fall in July, but not incredible.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.