crass

As an adjective crass is

coarse; crude; not refined or sensible.

As adjectives the difference between naive and crass

is that naive is while crass is coarse; crude; not refined or sensible.

As an adjective crass

is coarse; crude; not refined or sensible.

As a noun grossness is

(obsolete) size.

As adjectives the difference between crash and crass

is that crash is quick, fast, intensive while crass is coarse; crude; not refined or sensible.

As a noun crash

is an automobile, airplane, or other vehicle accident.

As a verb crash

is to collide with something destructively, fall or come down violently.