faithless

Meaning

1. Lacking faith; lacking belief in something.
2. Not believing in God, religion, or a comparable ideology.
3. Unfaithful (said of people, towards their partners)
4. Not observant of promises or covenants.
5. Not true to allegiance, duty, or vows
6. Serving to disappoint or deceive

Synonyms

unfaithful

disloyal

perfidious

traitorous

treacherous

treasonous

treasonable

infidel

unbeliever

false

punic

recreant

renegade

shifting

shoddy

sly

sneaky

tricksy

ungodly

unstable

untrustworthy

false-hearted

be disloyal

Punic

breaking one’s promises

deceitful

delusive

delusory

devious

dishonest

disingenuous

double-dealing

duplicitous

Translations

treulos

ungläubig

sadakatsiz

trouweloos

infedele

perfidiosus

perfide

athée

infidèle

unzuverlässig

ateo

άπιστος

infido

infideles

sans foi

Etymology

Inherited from Middle English: feithles

In summary

From Middle English feithles, equivalent to faith + -less.