未必

wèibì
  1. not necessarily
  2. maybe not

CEDICT

Entry Composition

1 未 wèi
  1. not yet
  2. did not
  3. have not
  4. not
  5. 8th earthly branch: 1-3 p.m., 6th solar month (7th July-6th August), year of the Sheep
  6. ancient Chinese compass point: 210°
2 必 bì
  1. certainly
  2. must
  3. will
  4. necessarily