The best replacement for testimony is testimonial.

The best alternatives to testimony are rated as following:
★★★★★  testimonial
★★★  testament
★  hearsay
★  deposition
★  affidavit
  peer testimony
  evidence
  hearsay testimony
  witness testimony
  physical evidence

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Speaking about testimony, one probably shouldn't forget about test there is no.

Other search terms related to testimony and their ratings are:
★★★★★ test there is no
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