Synonyms for Be careful:

• v.

  •look out (verb)
  • check out,
  • have a care,
  • listen,
  • keep tabs,
  • mind,
  • peg,
  • spy,
  • pay attention,
  • hearken,
  • be alert,
  • keep an eye out,
  • spot,
  • pick up on,
  • notice,
  • be on guard,
  • shotgun,
  • heads up,
  • scope,
  • size up.

• Other synonyms:

  •look out
  • Shotguns,
  • keeping tabs,
  • paying attention,
  • shotgunning,
  • shotgunned,
  • scoping,
  • paid attention,
  • watching out,
  • scoped,
  • picking up on.
  •skimp
  • go easy.
  •Other relevant words:
  • pussyfoot,
  • take good care,
  • take heed,
  • guard,
  • be discreet,
  • take it easy,
  • be wary,
  • be vigilant,
  • take care,
  • be watchful,
  • watch one's step,
  • hold,
  • be cautious,
  • watch,
  • take pains,
  • step,
  • think twice,
  • bend over backwards,
  • look,
  • go on tiptoe,
  • tiptoe.

Antonyms for Be careful:

• v.

  • look out
    ignore, neglect, disregard.