gruñón
/ɡɾuˈɲon/ · B2 · adj
grumpy, grouchy
😠🐻 gruñón = gruñir (to growl/grunt) + -ón (habitual doer): a constant growler
Gruñir means to growl or grunt, and the suffix -ón marks someone who does it all the time. The ñ sounds like 'ny', so gruñón is 'groo-NYOHN': someone who grunts and growls at everything, a grump.