un·ob·tru·sive /ˌʌnəbˈtrusɪv, zɪv/
  (a.)不多嘴的,客氣的,謙虛的
  Un·ob·tru·sive a. Not obtrusive; not presuming; modest. -- Un*ob*tru*sive*ly, adv. -- Un*ob*tru*sive*ness, n.
  ◄ ►
  unobtrusive
       adj : not obtrusive or undesirably noticeable; "a quiet,
             unobtrusive life of self-denial" [syn: unnoticeable]
             [ant: obtrusive]