false false /ˈfɔls/

adjective

1. () Not in accordance with the fact, reality or actuality  ( false )
   not in accordance with the fact, reality or actuality
    Gave false testimony under oath
   gave false testimony under oath
    False tales of bravery
   false tales of bravery
   
2. () Arising from error  ( false , mistaken )
   arising from error
    A false assumption
   a false assumption
    A mistaken view of the situation
   a mistaken view of the situation
   
3. (used especially of persons) not dependable in devotion or affection; unfaithful  ( false , untrue )
   (used especially of persons) not dependable in devotion or affection; unfaithful
    A false friend
   a false friend
    When lovers prove untrue
   when lovers prove untrue
   
4. Adopted in order to deceive  ( assumed , false , fictitious , fictive , pretended , put on , sham )
   adopted in order to deceive
    An assumed name
   an assumed name
    An assumed cheerfulness
   an assumed cheerfulness
    A fictitious address
   a fictitious address
    Fictive sympathy
   fictive sympathy
    A pretended interest
   a pretended interest
    A put-on childish voice
   a put-on childish voice
    Sham modesty
   sham modesty
   
5. Inaccurate in pitch  ( false , off-key , sour )
   inaccurate in pitch
    A false (or sour) note
   a false (or sour) note
    Her singing was off key
   her singing was off key
   
6. Designed to deceive  ( false )
   designed to deceive
    A suitcase with a false bottom
   a suitcase with a false bottom
   
7. Not genuine or real; being an imitation of the genuine article  ( fake , false , faux , imitation , simulated )
   not genuine or real; being an imitation of the genuine article
    It isn't fake anything; it's real synthetic fur
   it isn't fake anything; it's real synthetic fur
    Faux pearls
   faux pearls
    False teeth
   false teeth
    Decorated with imitation palm leaves
   decorated with imitation palm leaves
    A purse of simulated alligator hide
   a purse of simulated alligator hide
   
8. Inappropriate to reality or facts  ( delusive , false )
   inappropriate to reality or facts
    Delusive faith in a wonder drug
   delusive faith in a wonder drug
    Delusive expectations
   delusive expectations
    False hopes
   false hopes
   
9. Deliberately deceptive  ( false )
   deliberately deceptive
    False pretenses
   false pretenses
   
10. Erroneous and usually accidental  ( false )
    erroneous and usually accidental
     A false start
    a false start
     A false alarm
    a false alarm
    

adverb

1. In a disloyal and faithless manner  ( faithlessly , false , traitorously , treacherously , treasonably )
   in a disloyal and faithless manner
    He behaved treacherously
   he behaved treacherously
    His wife played him false
   his wife played him false