IPA: /ˌʌn.kɒn.trəˈvɜː.ʃəl/
KK: /ʌnˌkɒntrəˈvɜːrʃəl/
Not causing any disagreement or argument; accepted by most people without dispute.
The proposal was considered uncontroversial and received widespread support.
Uncontroversial → It is formed from "un-" (meaning not), "controversy" (from Latin "controversia", meaning a turning against or dispute), and the suffix "-al" (meaning relating to). The word "uncontroversial" means not relating to or causing any dispute or controversy.
Think of 'not' ('un-') causing a 'dispute' ('controversy') — that's why uncontroversial means something that doesn't lead to disagreement.