Which preposition to use with offhand

as Occurrences 2%

In De Haas, "The American Pioneer," etc., can be found all kinds of stories, some even told by members of the Clark and Lewis families, which are meant to criminate Dunmore, but which make such mistakes in chronologyplacing the battle of Lexington in the year of the Kanawha fight, asserting that peace was not made till the following spring, etc.that they must be dismissed offhand as entirely untrustworthy.

with Occurrences 1%

How he had been offhand with it, how he had made it parenthetic, that he didn't happen "personally" to know Basil Frenchas if it would have been at all likely he should know him, even im personally, and as if he could conceal from her the fact that, since she had made him her overture, this gentleman's name supremely baited her hook!

without Occurrences 1%

But this had no work on itthrown together perfectly at random, spoken offhand without any special preparation, and it succeeds when the thing we study, work over, adjust to a plan is an entire failure.

Which preposition to use with  offhand