IPA: /ˌkɒntrəˈvɜːʃəli/
KK: /kɒntrəˈvɜːrʃəli/
In a way that causes disagreement or controversy.
The decision was made controversially, sparking debates among the community.
Controversially → It is formed from "controversy" (from Latin "controversia", meaning a turning against or dispute) and the suffix "-ally" (meaning in a manner). The word "controversially" means in a manner that causes disagreement or dispute.
Think of a situation that causes people to 'turn against' each other ('controversy') and how it can happen 'in a manner' ('-ally'). This helps you remember that 'controversially' refers to something done in a way that leads to disagreement.