faithless, false, disloyal, traitorous, treacherous, perfidious mean untrue to what should command one's fidelity or allegiance.

What does the term consanguinity mean?

: of the same blood or origin specifically : descended from the same ancestor consanguineous brothers.

What does it mean if something is pretentious?

a : making usually unjustified or excessive claims (as of value or standing) the pretentious fraud who assumes a love of culture that is alien to him— Richard Watts. b : expressive of affected, unwarranted, or exaggerated importance, worth, or stature pretentious language pretentious houses.