不经意间

不經意間
bùjīngyìjiān
  1. without paying attention
  2. without noticing
  3. unconsciously
  4. inadvertently

CEDICT

Entry Composition

1 不经意 bùjīngyì not paying attention; carelessly; by accident
2 间 jiān
  1. between
  2. among
  3. within a definite time or space
  4. room
  5. section of a room or lateral space between two pairs of pillars
  6. classifier for rooms

Related entries

不觉 bùjué unconsciously
我不觉得他诚实。

I don't think that he's honest.

Source: Tatoeba

无意间 wúyìjiān
  1. inadvertently
  2. unintentionally
我無意間找到從前弄丟的相機。

I happened to find the camera I'd lost.

Source: Tatoeba