IPA: /ˈɡeɪpɪŋli/
KK: /ˈɡeɪpɪŋli/
In a way that shows a large opening or gap; widely open.
The door was left gapingly ajar, allowing the cold wind to enter.
Gapingly → It is formed from "gape" (from Old English "gapa", meaning to open wide or yawn) and "-ingly" (a suffix used to form adverbs). The word "gapingly" means in a manner that is wide open or yawning.
Imagine something that is 'wide open' ('gape') and doing it 'in a manner' ('-ingly'). This helps you remember that 'gapingly' describes something that is open wide.