a.

1. 不正确的，谬误的；不真实的
   What you're saying is false.

   你所说的是假的。

   I don't want to give you a false impression.

   我不想给你一个虚假的印象。

2. 不诚实的；虚妄的
   He was accused of giving false witness.

   他被指控作伪证。

3. 不忠实的，无信义的[（+to）]
   Better an open enemy than a false friend.

   明枪易躲，暗箭难防。

4. 假的；伪造的；人造的
   She wore false hair to the dance.

   她戴着假发去参加舞会。

5. 全无根据的；与实际不符合的

adj.

1. not according with truth or fact.
   ▸invalid or illegal:

   false imprisonment.
2. deliberately intended to deceive.
   ▸artificial.
3. not actually so; illusory.
   ▸used in names of plants, animals, and gems that superficially resemble the thing properly so called, e.g. false scorpion.
4. disloyal.