IPA: /ˈblʌndərɪŋli/
KK: /ˈblʌndərɪŋli/
In a way that involves making mistakes or acting clumsily.
He blunderingly tried to fix the broken machine, but only made it worse.
Blunderingly is formed from "blunder" (of uncertain origin, possibly from Middle English *blunderen*, meaning to stumble or make a mistake) and the suffix "-ingly" (meaning in a manner of). The word describes acting in a manner that involves making mistakes or stumbling.
Think of someone who is 'stumbling' or making mistakes ('blunder') and doing so 'in a manner' ('-ingly'). This helps you remember that 'blunderingly' means acting in a way that involves errors.