The best replacement for formal is informal.

The best alternatives to formal are rated as following:
★★★★★  informal
★★★★  informal assessment
★★★★  informal language
★★★  informal writing
★★★  informal communication
★★★  semi formal
★  informal spanish
★  informal assessments
★  informal education
★  informal learning
★  informal sanctions
★  informal rulemaking
★  black tie
★  informal groups
★  informal organization
★  informal amendments
  informal diction
  prom dresses
  informal english
  informal social control
  informal economy
  informal speech
  informal research
  informal tone
  informal commands
  informal deviance
  informal organizations
  semi formal attire
  informal fallacies
  formal
  informal mentoring
  cocktail attire
  casual
  semi-formal
  black tie optional

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Google Trends

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