The difference between Crappy and Massive

When used as adjectives, crappy means of very poor quality, whereas massive means of or pertaining to a large mass.

Massive is also noun with the meaning: a homogeneous mass of rock, not layered and without an obvious crystal structure.

check bellow for the other definitions of Crappy and Massive

Crappy as an adjective (chiefly, North America, colloquial, mildly, vulgar):

Of very poor quality; unpleasant; distasteful.

Examples:

"That is such a crappy car."

"The referee just made a really crappy call."

"The food there used to be good but now it's crappy."
Crappy as an adjective (chiefly, North America, colloquial, mildly, vulgar, especially with "feel"):

Bad, sick, or depressed.

Examples:

"I'm feeling really crappy - I think I need some fresh air."
Crappy as an adjective (chiefly, North America, colloquial, mildly, vulgar):

Covered in crap (faeces/feces).

Examples:

"Put the crappy diapers in the blue pail and the wet ones in the yellow pail."

Massive as an adjective:

Of or pertaining to a large mass; weighty, heavy, or bulky.

Examples:

"A massive comet or asteroid appears to have ended the era of the dinosaurs."
Massive as an adjective:

Much larger than normal.

Examples:

"Compared to its counterparts from World War II, the Abrams main battle tank is truly massive."
Massive as an adjective:

Of great significance or import; overwhelming.

Examples:

"The enlightenment comprises massive shifts in many areas of Western thought."
Massive as an adjective (mineralogy):

Not exhibiting crystal form.
Massive as an adjective:

Of particularly exceptional quality or value; awesome.

Examples:

"Did you see Colbert last night? He was massive!"
Massive as an adjective (colloquial, informal, Ireland):

outstanding, beautiful

Examples:

"Your dress is massive, love. Where did you get it?"
Massive as an adjective (informal):

To a very great extent; total, utter.
Massive as an adjective (physics):

(of a particle) Possessing mass.

Examples:

"Some bosons are massive while others are massless."

Massive as a noun (mineralogy):

A homogeneous mass of rock, not layered and without an obvious crystal structure.

Examples:

"karst massives in western Georgia"
Massive as a noun (slang):

A group of people from a locality, or sharing a collective aim, interest, etc.

Examples:

"Big up to the Croydon massive!"