Definitions of false:

• adjective:   designed to deceive

  Example: "A suitcase with a false bottom"

• adjective:   deliberately deceptive

  Example: "Hollow (or false) promises"

• adjective:   not in accordance with the fact or reality or actuality

  Example: "Gave false testimony under oath"

• adjective:   erroneous and usually accidental

  Example: "A false start"

• adjective:   (used especially of persons) not dependable in devotion or affection; unfaithful

  Example: "A false friend"

• adjective:   arising from error

  Example: "A false assumption"

• adjective:   inaccurate in pitch

  Example: "A false (or sour) note"

• adjective:   not genuine or real; being an imitation of the genuine article

  Example: "False teeth"

• adjective:   inappropriate to reality or facts

  Example: "False hopes"

• adjective:   adopted in order to deceive
• adverb:   in a disloyal and faithless manner

  Example: "His wife played him false"