Synonyms for As a rule:

• adv

  •largely (adverb)
  • in a grand manner.
  •mostly (adverb)
  • almost entirely.

• adv.

  •frequently (adverb)
  • oft,
  • in quick succession,
  • not seldom,
  • successively,
  • recurrently,
  • often,
  • periodically,
  • many a time,
  • spasmodically,
  • many times,
  • thick and fast,
  • time and again,
  • over and over,
  • every now and then,
  • at regular intervals,
  • again and again,
  • at short intervals,
  • intermittently,
  • at times,
  • oftentimes,
  • not infrequently,
  • in many instances,
  • ofttimes,
  • very often,
  • much.
  •generally (adverb)
  • chiefly,
  • widely,
  • popularly,
  • principally,
  • primarily,
  • extensively,
  • roughly,
  • about,
  • publicly,
  • largely,
  • roundly,
  • universally,
  • altogether,
  • approximately,
  • practically.
  •habitually (adverb)
  • naturally.
  •largely (adverb)
  • expansively,
  • imposingly,
  • immoderately,
  • magnificently,
  • grandly,
  • prodigiously,
  • in a big way,
  • abundantly,
  • copiously,
  • mainly,
  • prodigally,
  • comprehensively,
  • generously,
  • lavishly,
  • Commodiously,
  • extravagantly,
  • liberally,
  • voluminously,
  • on a large scale,
  • considerably.

• Other synonyms:

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

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.