IPA: /ʌnˈhæmpəd/
KK: /ʌnˈhæmpərd/
Not restricted or limited in any way; free to act or move as one wishes.
The project proceeded unhampered by any external pressures.
Unhampered → It is formed from "un-" (meaning not) and "hampered" (from the verb "hamper", which comes from Middle English *hamperen*, meaning to hinder or obstruct). The word "unhampered" means not hindered or obstructed in any way.
Think of being 'not' ('un-') 'hindered' or 'obstructed' — that's what unhampered means.