Synonyms for As a rule:

• adv.

  •generally (adverb)
  • largely,
  • principally,
  • roughly,
  • chiefly,
  • primarily,
  • altogether.
  •habitually (adverb)
  • naturally.
  •largely (adverb)
  • mainly.

• Other synonyms:

  •Other relevant words:
  • especially,
  • above all,
  • rule,
  • inveterately,
  • average,
  • as things go,
  • in particular,
  • Prevailingly,
  • normatively,
  • as a whole,
  • pre-eminently,
  • most of all,
  • as a matter of course,
  • to be expected,
  • on balance,
  • all things considered,
  • Prescriptively,
  • whole.

Antonyms for As a rule:

• adv.

  • commonly
    infrequently, rarely, unusually, seldom, uncommonly.
  • frequently
    not much.
  • generally
    particularly, specifically, sometimes, exactly.
  • normally
    abnormally, never.
  • usually
    exceptionally.