不大

bùdà
  1. not very (clear, far away etc); not too
  2. not often; infrequently

CEDICT

Entry Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 大 dà
  1. big; large; great
  2. older (than another person)
  3. eldest (as in 大姐 dàjiě)
  4. greatly; freely; fully
  5. (dialect) father
  6. (dialect) uncle (father's brother)