i Register
In some senses, kerflummox is marked as informal, archaic. Watch for register when choosing this word.
verb
To flummox; to perplex or baffle.
To ponder or meditate.
Disko Troop was smoking by the roof of the cabin—one eye on the craft around, and the other on the little fly at the main-mast-head. "When Dad kerflummoxes that way," said Dan in a whisper, "he's doin' some high-line thinkin' fer all hands. I'll lay my wage an' share we'll make berth soon. […]"