The word Sus is meant to suggest that somone is believed to be Shady or false. They are hiding something or are believed to have a serious character flaw which makes them undesirible as a friend or acqaintence. It is derived from its root word Suspect.
Medieval Greek, also known as Byzantine Greek, is the stage of the Greek language between the beginning of the Middle Ages around 600 and the Ottoman conquest of the city of Constantinople in 1453. The latter date marked the end of the Middle Ages in Southeast Europe.
The only extant language in this branch is Modern Greek. Greek is one of the oldest Indo-European languages. Mycenaean dates from 1300BC. The Ancient Greek of Homer was written from around 700BC. The major forms were Doric (Sparta), Ionic (Cos), Aeolic (Lesbos), and Attic (Athens). The latter is Classical Greek.