What does moestus mean in Latin?

moestus, a adjective, means “sad, unhappy; mournful, gloomy; stern, grim”.

How do you pronounce moestus?

In classical Latin, [ˈmoe̯s.tʊs]; in ecclesiastical (church) Latin, [ˈmɛs.tus].

adjectivefirst/second-declension adjective

moestus (feminine moesta, neuter moestum)

Classical[ˈmoe̯s.tʊs]Ecclesiastical[ˈmɛs.tus]

singular
form	masculine	feminine	neuter
nominative	moestus	moesta	moestum
genitive	moestī	moestae	moestī
dative	moestō	moestae	moestō
accusative	moestum	moestam	moestum
ablative	moestō	moestā	moestō
vocative	moeste	moesta	moestum

plural
form	masculine	feminine	neuter
nominative	moestī	moestae	moesta
genitive	moestōrum	moestārum	moestōrum
dative	moestīs	moestīs	moestīs
accusative	moestōs	moestās	moesta
ablative	moestīs	moestīs	moestīs
vocative	moestī	moestae	moesta

A late formation as a perfect participle to moereō (“to be sad”) which in Classical Latin has neither a supine nor a perfect stem.