ODD ONE OUT XVIII

All the phrases below have something in common - except one. Which one is the odd one out - and why?

BE CAREFUL

NOT OFTEN

FEAR OF HEIGHTS

ABALONE SHELL

CANINE TOOTH

THAT WOMAN

 

Answer:

 

CAREFUL is the odd one out. All the others have number words in them:

 

not ofTEN

fear of hEIGHTs

abalONE shell

caNINE tooth

thaT WOman