validness

As nouns the difference between validness and null

is that validness is the state of being valid while null is a non-existent or empty value or set of values.

As an adjective null is

having no validity, "null and void.

As a verb null is

to nullify; to annul.

As nouns the difference between effectiveness and validness

is that effectiveness is the property of being effective, of achieving results while validness is the state of being valid.

As nouns the difference between validness and effectivity

is that validness is the state of being valid while effectivity is (uncountable) the ability or power to be effective.

As nouns the difference between vapidness and validness

is that vapidness is the state or quality of being vapid; vapidity while validness is the state of being valid.

As nouns the difference between validity and validness

is that validity is the state of being valid, authentic or genuine while validness is the state of being valid.