Native speaker
In Emirati Arabic, “Bitter” is مُر (mur).
مُر
Bitter
It's in the phrasebook under Yes, no & everyday basics, with 90 more like it.
muthalath
taazij
imdawwar
haamudh
'areedh
haar
Source: DLIFLC Emirati Basic Language Survival Kit (2007). Credits and licences