IPA: /ˈɡrʌməst/
KK: /grʌmɪst/
The most unhappy or gloomy in appearance or mood.
After hearing the bad news, he had the grummest expression on his face.
Comparative: grummer
Superlative: grummest
The word 'grummest' is derived from the adjective 'grum', which comes from Middle English 'grum', meaning sullen or gloomy. The suffix '-est' is a superlative marker indicating the highest degree. Therefore, 'grummest' means the most sullen or gloomy.
Think of 'grum' as a way to describe someone who is very gloomy or sullen, and remember that 'grummest' means the most gloomy.