I guess not

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I guess not.

 and (I) don't think so.; I expect not.; I suppose not.; I suspect not.; I think not.
a vague statement of negation. (More polite or gentle than simply saying no. Frequently, in speech, suppose is reduced to 'spose, and expect and suspect are reduced to 'spect. The apostrophe is not always shown.) Bill: It's almost too late to go to the movie. Shall we try anyway? Mary: I guess not. Tom: Will it rain? Mary: I 'spect not.
See also: guess, not
References in classic literature ?
No -- I -- I suppose not," murmured Anne, seeing that Miss Patty was quite solemnly in earnest.
No one could dispute, Arthur--Mr Clennam--that it's quite right you should be formally friendly to me under the altered circumstances and indeed you couldn't be anything else, at least I suppose not you ought to know, but I can't help recalling that there was a time when things were very different.