grundy /ˈɡɹʌn.di/adjective 1noun 3forms 3 adjective1 •Overly concerned with censoring or criticizing personal conduct. noun3 •A narrow-minded person or group that is overly concerned with censoring or criticizing personal conduct. •(UK, slang) A pair of underpants •Granulated or shotted pig iron. formsgrundies · grundier · grundiest