笨到家了

bèndàojiāle
extremely stupid

CEDICT

Entry Composition

1 笨 bèn
  1. stupid
  2. foolish
  3. silly
  4. slow-witted
  5. clumsy
2 到家 dàojiā
  1. perfect
  2. excellent
  3. brought to the utmost degree
3 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)