backfriend

As a noun backfriend

is a false friend; a secret enemy.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between taxonomy and backfriend

is that taxonomy is the science or the technique used to make a classification while backfriend is a false friend; a secret enemy.

As nouns the difference between hangnail and backfriend

is that hangnail is a loose, narrow strip of nail tissue protruding from the side edge and anchored near the base of a fingernail or toenail while backfriend is a false friend; a secret enemy.

As nouns the difference between supporter and backfriend

is that supporter is a person who gives support to someone or something while backfriend is a false friend; a secret enemy.

As nouns the difference between backer and backfriend

is that backer is baker while backfriend is a false friend; a secret enemy.

As nouns the difference between secret and backfriend

is that secret is (countable|uncountable) knowledge that is hidden and intended to be kept hidden while backfriend is a false friend; a secret enemy.

As an adjective secret

is being or kept hidden.

As a verb secret

is to make or keep secret.

As nouns the difference between friend and backfriend

is that friend is a quaker; a member of the while backfriend is a false friend; a secret enemy.

As a proper noun friend

is .

As nouns the difference between false and backfriend

is that false is one of two options on a true-or-false test while backfriend is a false friend; a secret enemy.

As an adjective false

is untrue, not factual, factually incorrect.

As an adverb false

is not truly; not honestly; falsely.