feeble-mindedly

adverb

fee·​ble-mind·​ed·​ly ˌfē-bəl-ˈmīn-dəd-lē 

variants or feeblemindedly

: in a feebleminded (see feebleminded sense 2) manner

… did they have to lend themselves so feeble-mindedly to such a partisan event?

—Tom Shales

Quinn paused for a moment to ponder what he was doing. Was he scribbling nonsense? Was he feeble-mindedly frittering away the evening, or was he trying to find something?

—Paul Auster

Word History

First Known Use

1890, in the meaning defined above