1. extremely deep
1. The wreck of the Titanic was finally found in the abysmal depths of the north Atlantic.
2. extremely poor in quality
2. His first three films were brilliant, but his most recent one is abysmal.
a (without)#byssos (bottom) (Greek)
a+bys (take dis as 20 i.e. bees in hindi)+mal (take it as mile). ao a 20 mile deep pit in the ground looks like its bottomless bys. sounds like base. a-base. no base. so bottomless