IPA: /ˈkwɛs.tʃən.ə.bli/
KK: /ˈkwɛs.tʃən.ə.bli/
In a way that raises doubts or uncertainty about something.
The decision was made questionably, leaving many people confused.
Questionably → It is formed from "question" (from Latin "quaestio", meaning inquiry or a matter to be resolved) and "-ably" (meaning in a manner that can be). The word "questionably" means in a manner that raises questions or doubts.
Think of 'question' as an inquiry that can be doubted, and '-ably' means in a way that allows for that doubt.