valid

As adjectives the difference between valid and approved

is that valid is well grounded or justifiable, pertinent while approved is having received approval.

As a verb approved is

past tense of approve.

As an adjective valid

is well grounded or justifiable, pertinent.

As an adverb not is

negates the meaning of the modified verb.

As a conjunction not is

and not.

As an interjection not is

used to indicate that the previous phrase was meant sarcastically or ironically.

As a noun not is

unary logical function NOT, true if input is false, or a gate implementing that negation function.

As adjectives the difference between valid and working

is that valid is valid while working is that is or are functioning.

As a noun working is

(usually plural) operation; action.

As a verb working is

.

As adjectives the difference between efficient and valid

is that efficient is efficient while valid is valid.

As adjectives the difference between valid and official

is that valid is valid while official is of or pertaining to an office or public trust.

As a noun official is

an office holder invested with powers and authorities.

As adjectives the difference between valid and usable

is that valid is well grounded or justifiable, pertinent while usable is capable of being used.

As adjectives the difference between valid and resolute

is that valid is valid while resolute is firm, unyielding, determined.

Apt is a related term of valid.

As a noun apt

is .

As a proper noun apt

is .

As an adjective valid is

valid.

Valid is a related term of weighty.

As adjectives the difference between valid and weighty

is that valid is valid while weighty is having weight; heavy; ponderous; as, a weighty body.

Valid is a synonym of just.

As an adjective valid

is valid.

As a proper noun just is

, cognate to english justus.