un·ob·tru·sive
adjective/ˌʌnəbˈtruːsɪv/
/ˌʌnəbˈtruːsɪv/
(formal, often approving)- not attracting unnecessary attention
不张扬的；不招摇的 - The service at the hotel is efficient and unobtrusive.
那旅馆的服务既有效率，又沉稳低调。
- The service at the hotel is efficient and unobtrusive.