English to English

adjective (a)

• not obtrusive or undesirably noticeable(adj.all)

  Example:
  A quiet, unobtrusive life of self-denial.
  

  Synonym:
  unnoticeable
  Antonym:
  noticeable, obtrusive
  

  source: wordnet30
• Not obtrusive; not presuming; modest.(adjective)

  source: webster1913