I have heard, e.g "surer than ever" and I would use it in speech, but the phrase may be an idiom; in your sentence I would go with you and tell MS word to go jump on itself. I would never use MS Word Grammar Check for fiction; it's geared for commercial and business documents and for an reading age of eight. Last time I tried I had a character who was a Duchess, and every time the word cropped up it suggested gender-neutral options...
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