sassy

As a noun brat

is brother.

As an adjective sassy is

impudent.

As adjectives the difference between sassy and false

is that sassy is impudent while false is (label) one of two states of a boolean variable; logic.

As adjectives the difference between sassy and smartass

is that sassy is impudent while smartass is (slang) related to or characteristic of a smartass.

As a noun smartass is

(slang) one who is particularly insolent, who tends to make snide remarks or jokes.

As adjectives the difference between sassy and undefined

is that sassy is impudent while undefined is lacking a definition or value.

As a proper noun jolly

is (female).

As an adjective sassy is

impudent.

As adjectives the difference between sassy and grouchy

is that sassy is impudent while grouchy is irritable; easily upset; angry; tending to complain.

As adjectives the difference between lippy and sassy

is that lippy is talking back, in a cheeky manner while sassy is impudent.

As a noun lippy

is lipstick.

As an adjective sassy

is impudent.

As a noun null is

zero, nil; the cardinal number before einn.

As a proper noun kirsty

is (female), scottish diminutive of christine.

As an adjective sassy is

impudent.

As adjectives the difference between sassy and salary

is that sassy is impudent while salary is (obsolete) saline.

As a noun salary is

a fixed amount of money paid to a worker, usually measured on a monthly or annual basis, not hourly, as wages implies a degree of professionalism and/or autonomy.

As a verb salary is

to pay on the basis of a period of a week or longer, especially to convert from another form of compensation.