unfaithful
adj
ʌnˈfeɪθfəl
adj
1
someone
who
is
unfaithful
has
sex
with
someone
who
is
not
their
wife,
husband,
or
usual
partner
不忠的
[+
to
]
Geoff
had
been
unfaithful
to
her
on
many
occasions.
杰夫多次对她不忠。