false

adjective

1
(used especially of persons) not dependable in devotion or affection; unfaithful
a false friend
when lovers prove untrue
2
arising from error
a false assumption
a mistaken view of the situation
3
adopted in order to deceive
an assumed name
an assumed cheerfulness
4
inaccurate in pitch
a false (or sour) note
her singing was off key
5
designed to deceive
a suitcase with a false bottom
6
not genuine or real; being an imitation of the genuine article
it isn't fake anything; it's real synthetic fur
faux pearls
7
inappropriate to reality or facts
delusive faith in a wonder drug
delusive expectations
8
deliberately deceptive
false pretenses
9
not in accordance with the fact or reality or actuality
gave false testimony under oath
false tales of bravery
10
erroneous and usually accidental
a false start
a false alarm

1
in a disloyal and faithless manner
he behaved treacherously
his wife played him false

Also useful for “false”:Wordle Solver— Five letters — perfect Wordle material