spurious

As an adjective spurious is

false, not authentic, not genuine.

As adjectives the difference between spurious and insidious

is that spurious is false, not authentic, not genuine while insidious is producing harm in a stealthy, often gradual, manner.

Impure is a related term of spurious.

As adjectives the difference between impure and spurious

is that impure is not pure while spurious is false, not authentic, not genuine.

As a verb impure

is (obsolete) to defile; to pollute.

Imperfect is a related term of spurious.

As adjectives the difference between imperfect and spurious

is that imperfect is not perfect while spurious is false, not authentic, not genuine.

As a noun imperfect

is something having a minor flaw.

As adjectives the difference between irregular and spurious

is that irregular is nonstandard; not conforming to rules or expectations while spurious is false, not authentic, not genuine.

As a noun irregular

is a soldier who is not a member of an official military force and, often, does not follow regular army tactics.

As adjectives the difference between spurious and imaginary

is that spurious is false, not authentic, not genuine while imaginary is existing only in the imagination.

As a noun imaginary is

imagination; fancy.

As adjectives the difference between unsound and spurious

is that unsound is not sound; not whole; not solid; defective; infirm; diseased while spurious is false, not authentic, not genuine.

Spurious is a related term of fanciful.

As adjectives the difference between spurious and fanciful

is that spurious is false, not authentic, not genuine while fanciful is imaginative or fantastic; unreal or imagined.

Spurious is a related term of phoney.

As adjectives the difference between spurious and phoney

is that spurious is false, not authentic, not genuine while phoney is .

As a noun phoney is

.

Faulty is a related term of spurious.

As adjectives the difference between faulty and spurious

is that faulty is having or displaying faults; not perfect; not adequate or acceptable while spurious is false, not authentic, not genuine.