Synonyms for With forethought:

• adj.

  •deliberate (adjective)
  • cold-blooded,
  • aforethought,
  • prearranged,
  • projected,
  • thought out,
  • premeditated,
  • conscious,
  • cut-and-dried,
  • advised,
  • careful,
  • scrupulous,
  • Purposed,
  • Predeterminate,
  • coldblooded,
  • Weighed,
  • voluntary,
  • Schemed,
  • purposive,
  • Pondered,
  • studious,
  • thoughtful,
  • studied,
  • Designful,
  • reasoned,
  • planned,
  • meticulous,
  • calculated,
  • provident,
  • Judged,
  • predetermined,
  • willful,
  • done on purpose,
  • witting,
  • prudent,
  • cautious,
  • Prepense,
  • express,
  • resolved,
  • considered,
  • predesigned,
  • fixed,
  • purposeful,
  • wary,
  • cut and dried,
  • intended,
  • designed.

• adv

  •seriously (adverb)
  • with straight face.

• adv.

  •carefully (adverb)
  • thoroughly,
  • correctly,
  • particularly,
  • honorably,
  • delicately,
  • exactly,
  • scrupulously,
  • precisely,
  • faithfully,
  • fully,
  • deliberately.
  •seriously (adverb)
  • down,
  • resolutely,
  • passionately,
  • earnestly,
  • with sobriety,
  • sincerely,
  • intently,
  • actively,
  • sedately,
  • fervently,
  • gravely,
  • solemnly,
  • sternly,
  • cool it,
  • in earnest,
  • in all seriousness,
  • for real,
  • with a straight face,
  • straighten out,
  • in all conscience,
  • purposefully,
  • vigorously,
  • simmer down,
  • zealously,
  • all joking aside,
  • cut the comedy,
  • determinedly,
  • soberly.

• Other synonyms:

  •adj.
  • deliberate.
  •adv
  • anxiously,
  • attentively,
  • carefully,
  • circumspectly,
  • concernedly,
  • conscientiously,
  • dependably,
  • discreetly,
  • fastidiously,
  • guardedly,
  • in detail,
  • providently,
  • prudently,
  • punctiliously,
  • rigorously,
  • seriously,
  • solicitously,
  • thoughtfully,
  • uprightly,
  • vigilantly,
  • watchfully,
  • Regardfully.
  •adv.
  • gingerly,
  • heedfully,
  • laboriously,
  • meticulously,
  • reliably,
  • warily,
  • Trustily,
  • with reservations.
  •n.
  • consciously.

Antonyms for With forethought:

• adj.

  • deliberate
    incautious, unintentional, imprudent, inattentive, unsystematic, careless, chance, unmethodical, thoughtless, heedless, unmindful, indefinite, unplanned, unwitting, uncareful, ignorant, indeterminate.

• adv.

  • carefully
    inadequately, carelessly, thoughtlessly, uncarefully, incautiously, partially, incompletely.
  • seriously
    casually, lightly, trivially, funnily, minor.