act contrary to nature
 

* 1.act unnaturally

2.behave abnormally

English Related Words* a hard act to follow

* a tough act to follow

* act

* act a part

* act against someone's orders

* act as

* act as host

* act declared void

* act firmly

* act for

* act for smb

* act in a case

* act in concert

* act in pais

* act in unison