What's the level of mutual intelligibility/transferrenc between ancient/modern Greek?

[vartan]

and I though Classical Arabic sounded funky compared to modern dialects


speaking of the recognizable: what other indoeuropean language is closest to Greek? I know Latin is actually not that close; doubtless there is a known language that is closer, alive or extinct? and what's the closest modern, living language?

I really don't know, just wanted to find out.

Armenian. But we're talking a long time ago, like when our words for God would sound more similar. When you had these IE people living in the older Phrygia, before the further stages of migration south and back east across the Hellespont. Armenian itself has subsumed parts of the Anatolian (mainly Luwian, some Hittite; these are IE) and Caucasian (its own family) tongues.