UNOBTRUSIVE
Meaning of UNOBTRUSIVE in English
un ‧ ob ‧ tru ‧ sive /ˌʌnəbˈtruːsɪv◂/ BrE AmE adjective
not easily noticed:
The staff are trained to be unobtrusive.
—unobtrusively adverb
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012