| Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993. |
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| dubious (adj.) |
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| when it combines with prepositions, usually takes of, about, over, and concerning, as in We were dubious of [about, over, concerning] their sincerity. See also EQUIVOCAL. | 1 |
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| | | The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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