1‘she left her faithless lover’
unfaithful, disloyal, inconstant, false, false-hearted, untrue, adulterous, traitorous, treacherous, perfidious, fickle, flighty, untrustworthy, unreliable, undependable, deceitful, deceiving, two-faced, Janus-faced, double-dealing, double-crossing
informal cheating, two-timing, back-stabbing
2‘the natives were ungodly and faithless’
unbelieving, non-believing, irreligious, without religious faith, disbelieving, doubting, sceptical, agnostic, atheistic, non-theistic
We take a look at several popular, though confusing, punctuation marks.