IPA: /ˈriːzənəbli/
KK: /ˈrizənəblē/
In a way that is fair and sensible; to a moderate degree.
The prices at the store are reasonably low compared to other shops.
Reasonably → It is formed from "reason" (from Latin *ratio*, meaning a calculation or reasoning) and "-ably" (meaning in a manner that can be). The word "reasonably" means in a manner that can be reasoned or justified.
Think of 'reason' as the basis for making decisions, and remember that 'reasonably' means acting in a way that can be justified or explained.