IPA: /ˌʌn.əbˈtruː.sɪv/
KK: /ʌnəbˈtruːsɪv/
Something that does not attract attention or is not easily noticed; it blends in without being obvious or intrusive.
The design of the new building is unobtrusive, allowing it to fit in with the surrounding architecture.
Unobtrusive → It is formed from "un-" (meaning not), "obtrusive" (from Latin "obtrudere", meaning to thrust forward). The word "unobtrusive" means not thrusting forward or not attracting attention.
Think of 'not' ('un-') being combined with 'thrusting forward' ('obtrusive') — that's why unobtrusive means not drawing attention.