Abysmal

A completely random picture of Justin Bieber

ABYSMAL

Adjective. M17.

[Old French abisme from Latin abyssus from Greek abyssos bottomless, from byssos depth, bottom] 

1. Of, pertaining to, or resembling an abyss. Now rare in a literal sense. M17.

2. fig. Bottomless; colloq. extremely bad. E19.

I had never thought of this word as related to the word abyss; it's kind of obvious when one thinks about it. I like it all the more now, in that it carries a sense of something being so utterly terrible and beyond bearing that it's worthy of being cast into the abyss itself. Cool.