frugal

As adjectives the difference between frugal and keen

is that frugal is avoiding unnecessary expenditure either of money or of anything else which is to be used or consumed; avoiding waste while keen is showing a quick and ardent willingness or responsiveness, enthusiastic, eager; interested, intense.

As a verb keen is

(rare) to sharpen; to make cold or keen can be to utter a keen.

As a noun keen is

a prolonged wail for a deceased person.

As adjectives the difference between frugal and fiscal

is that frugal is avoiding unnecessary expenditure either of money or of anything else which is to be used or consumed; avoiding waste while fiscal is related to the treasury of a country, company, region or city, particularly to government spending and revenue.

As a noun fiscal is

a public official in certain countries having control of public revenue or fiscal can be any of various african shrikes of the genus lanius .

As adjectives the difference between frugal and tightfisted

is that frugal is avoiding unnecessary expenditure either of money or of anything else which is to be used or consumed; avoiding waste while tightfisted is .

As a noun parsimony

is great reluctance to spend money unnecessarily.

As an adjective frugal is

avoiding unnecessary expenditure either of money or of anything else which is to be used or consumed; avoiding waste.

As adjectives the difference between frugal and saved

is that frugal is avoiding unnecessary expenditure either of money or of anything else which is to be used or consumed; avoiding waste while saved is (christianity) rescued from the consequences of sin.

As a verb saved is

(save).

As adjectives the difference between frugal and wasteful

is that frugal is avoiding unnecessary expenditure either of money or of anything else which is to be used or consumed; avoiding waste while wasteful is inclined to waste or squander money or resources.