The best replacement for agree is disagree.

The best alternatives to agree are rated as following:
★★★★★  disagree
★★★★★  agreed
★★  concur
★  accept
★  agree
  agrees
  strongly agree
  i am agree

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Speaking about agree, one probably shouldn't forget about synonym.

Other search terms related to agree and their ratings are:
★★★★★ synonym
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agree
disagree
agreed