The best replacement for informal is formal assessment.

The best alternatives to informal are rated as following:
★★★★★  formal assessment
★★★★★  formal
★★★★  formal writing
★★★  formal communication
★★★  formal language
★  formal learning
★  formal education
★  formal power
★  informal
★  formal commands
★  formal leadership
★  formal economy
★  formal letter
★  formal norms
★  formal fallacies
★  formal groups
★  nonformal
  formal organization
  formal spanish
  formal testing
  formal speech
  formal interview
  formal deviance
  colloquial
  formal english
  formal meeting
  formal assessments
  formal probate
  formal in spanish
  formal logic
  formal entry
  formal culture
  formal tone
  formal words
  formal organizations
  formal contracts
  formal wedding
  formal group
  formal essay
  formal letters
  formal amendments

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Google Trends

Scale is based on the average worldwide traffic of informal in all years. Click on graph for more.
informal
formal assessment
formal