a wild one
 

* 1.animal that is untamed

2.someone or something which is uncontrollable

3.person or animal which is spontaneous and unpredictable

English Related Words* a game one

* a hundred and one

* a hundred to one chance

* a one

* a one way ticket, please

* a quick one

* a short one

* a tall one

* a wild goose chase

* a wild guess

* abstract syntax notation one (asn.1)

* act one

* african wild ass

* after one

* aged one