Yes, false is a Scrabble word!

Adverb

1. In a disloyal and faithless manner

Adjective

1. Not in accordance with the fact or reality or actuality

2. Arising from error

3. Erroneous and usually accidental

4. Deliberately deceptive

5. Inappropriate to reality or facts

6. Not genuine or real; being an imitation of the genuine article; it's real synthetic fur"

7. Designed to deceive

8. Inaccurate in pitch

9. Adopted in order to deceive

10. (used especially of persons) not dependable in devotion or affection; unfaithful