Lugubrious
/luːˈɡuːbriəs/ adjective hardExaggeratedly or theatrically mournful, beyond what a situation calls for.
The actor's lugubrious sighs at every setback made the tragedy feel almost comic.
Memory Trick
From Latin 'lugere,' to mourn — lugubrious sadness is mourning turned up to a theatrical, over-the-top volume.