adverb (r)

• according to circumstances(adv.all)

  Example:
  He was convicted circumstantially.
  

  source: wordnet30
• insofar as the circumstances are concerned(adv.all)

  Example:
  The account was circumstantially accurate.
  

  source: wordnet30
• in minute detail(adv.all)

  Synonym:
  minutely
  

  source: wordnet30
• without advance planning(adv.all)

  Synonym:
  accidentally, by chance, unexpectedly
  Antonym:
  advisedly, by choice, by design, deliberately, designedly, intentionally, on purpose, purposely
  

  source: wordnet30
• In respect to circumstances; not essentially; accidentally.(adverb)

  source: webster1913