...Therefore, if you serve on board my vessels, there can be nothing equivocal about it, my dear vicomte; it will be the king you will serve... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
... “Yes, yes,; but you used a phrase which has a very equivocal significance; you are unfortunate in your phrases...
Alexandre Dumas, Pere 「Ten Years Later」
... should you retain an expression whose equivocal meaning will always be an obstacle in the way of your success? ...
P. J. Proudhon 「What is Property?」
...The foregoing circumstances, added to the variableness of pigments bynature, preparation, and sophistication, have often rendered theireffects equivocal, and their powers questionable...
George Field 「Field's Chromatography」
...One must be struck by a strange blindness to maintain such pitiable things, and that upon such vain foundation as the equivocal words of a fanatic...
Jean Meslier Anna Knoop 「Superstition In All Ages (1732)」
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