IPA: /ˌnɒnɪnˈtruːsɪv/
KK: /nɑnɪnˈtrusɪv/
Not causing disruption or disturbance; gentle and unobtrusive in nature.
The nonintrusive design of the software allows users to work without distractions.
Nonintrusive → It is formed from "non-" (meaning not) and "intrusivus" (from Latin "intrudere", meaning to thrust in). The word describes something that does not thrust in or disturb, hence it is unobtrusive or not invasive.
Think of 'not' ('non-') disturbing or 'thrusting in' ('intrusivus') — that's why nonintrusive means not intrusive.