IPA: /ˈsuːtəbli/
KK: /ˈsutəbli/
In a way that is appropriate or fitting for a particular situation.
The dress was suitably elegant for the formal event.
Suitably → It is formed from "suit" (from Old French *suiter*, meaning to follow or to be appropriate) and "-ably" (meaning in a manner that is). The word "suitably" means in a manner that is appropriate or fitting.
Think of something being done in a way that is 'appropriate' ('suit') — the '-ably' just means how it is done. This helps you remember that 'suitably' means doing something in an appropriate manner.