treacherous

As an adjective treacherous

is exhibiting treachery.

As a noun infidelity is

unfaithfulness in marriage: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.

As adjectives the difference between treacherous and specious

is that treacherous is exhibiting treachery while specious is seemingly well-reasoned, plausible or true, but actually fallacious.

As an adjective treacherous

is exhibiting treachery.

As a noun quicksand is

wet sand that things readily sink in, often found near rivers or coasts.

As adjectives the difference between treacherous and cruel

is that treacherous is exhibiting treachery while cruel is not nice; mean; heartless.

As a verb cruel is

to spoil or ruin (one's chance of success).

As adjectives the difference between sleazy and treacherous

is that sleazy is marked by low quality; inferior; inadequate while treacherous is exhibiting treachery.

As adjectives the difference between shabby and treacherous

is that shabby is torn or worn; poor; mean; ragged while treacherous is exhibiting treachery.

As adjectives the difference between treacherous and swike

is that treacherous is exhibiting treachery while swike is deceitful; treacherous.

As a verb swike is

to deceive, cheat; betray.

As a noun swike is

deceit; treachery.