shitless

As adjectives the difference between shitless and bitter

is that shitless is (vulgar) having an empty bowel; greatly frightened; (see usage notes below) while bitter is having an acrid taste (usually from a basic substance).

As a noun bitter is

(usually in the plural bitters) a liquid or powder, made from bitter herbs, used in mixed drinks or as a tonic.

As a verb bitter is

to make bitter.

As an adjective shitless is

(vulgar) having an empty bowel; greatly frightened; (see usage notes below).

As adjectives the difference between shipless and shitless

is that shipless is without a ship while shitless is (vulgar) having an empty bowel; greatly frightened; (see usage notes below).

As a noun shitness

is quality of being shit; or being of poor quality or of being undesirable.

As an adjective shitless is

having an empty bowel; greatly frightened; see usage notes below.

As adjectives the difference between hitless and shitless

is that hitless is (baseball) a batter who has failed to make any base hits over a period of time, usually one game while shitless is (vulgar) having an empty bowel; greatly frightened; (see usage notes below).

As adjectives the difference between shitless and shirtless

is that shitless is (vulgar) having an empty bowel; greatly frightened; (see usage notes below) while shirtless is not wearing a shirt having a bare torso.

As adjectives the difference between shitless and shiftless

is that shitless is (vulgar) having an empty bowel; greatly frightened; (see usage notes below) while shiftless is lazy, unmotivated.

As adjectives the difference between suitless and shitless

is that suitless is not wearing a suit while shitless is (vulgar) having an empty bowel; greatly frightened; (see usage notes below).

As adjectives the difference between shitless and slitless

is that shitless is having an empty bowel; greatly frightened; see usage notes below while slitless is not using a slit.