Synonyms for Be good:

• v.

  •act reasonably, properly (verb)
  • behave.
  •behave (verb)
  • shape up,
  • keep one's nose clean,
  • discipline oneself,
  • be nice,
  • mind one's p's and q's,
  • act with decorum,
  • demean oneself,
  • act one's age,
  • mind one's manners,
  • be on best behavior,
  • watch one's step,
  • live up to,
  • observe golden rule,
  • manage oneself,
  • toe the mark,
  • manage,
  • be civil,
  • conduct oneself properly,
  • direct,
  • observe the law,
  • keep the peace,
  • control,
  • comport oneself,
  • act correctly,
  • be orderly,
  • deport oneself.
  •be superior; surpass (verb)
  • excel.
  •excel (verb)
  • better,
  • wax,
  • take precedence,
  • be master of,
  • predominate,
  • come through,
  • make it,
  • outrival,
  • be skillful,
  • go to town,
  • surmount,
  • shine,
  • top,
  • be proficient,
  • improve upon,
  • outstrip,
  • exceed,
  • best,
  • show talent,
  • be talented,
  • pass,
  • transcend,
  • outdo,
  • go beyond,
  • cap,
  • outshine,
  • beat,
  • eclipse.

• Other synonyms:

  •
  • toe the line or mark,
  • walk with God,
  • goodbye.
  •behave
  • minding p's and q's,
  • watching one's step,
  • mind p's and q's.
  •excel
  • excels,
  • goes beyond,
  • outrivaling,
  • outrivalled,
  • outrivals,
  • going beyond,
  • outrivaled,
  • outrivalling,
  • transcends,
  • went beyond,
  • predominates,
  • improved upon,
  • made it.

Antonyms for Be good:

• v.

  • behave
    misbehave, act up.
  • excel
    fall behind, be inferior, surrender, lose, fail.