IPA: /ˌʌnəˈvɔɪdəbli/
KK: /ʌnəˈvɔɪdəbli/
In a way that cannot be avoided or prevented; something that must happen.
The meeting was unavoidably delayed due to bad weather.
Unavoidably → It is formed from "un-" (meaning not) and "avoid" (from Latin "vitare", meaning to shun or escape) and "-ably" (meaning in a manner that can be). The word means in a manner that cannot be escaped or avoided.
Think of 'not' ('un-') being combined with 'shunning' or 'escaping' ('vitare') — that's why unavoidably means something that cannot be escaped.