IPA: /ˈmænɪfɛstli/
KK: /ˈmænɪfɛstli/
In a way that is clear and obvious to everyone.
The solution to the problem was manifestly simple once we understood it.
Manifestly → It is formed from "manifeste" (from Latin *manifestus*, meaning clear or obvious) and the suffix "-ly" (meaning in a manner of). The word "manifestly" means in a clear or obvious manner.
Think of something being 'clear' or 'obvious' ('manifestus') and how the '-ly' makes it describe the manner of being clear.