avoid forbidden letters using python

'print words not having any of the forbidden letters'
def isNotForbid(word,forbidLetters):
    for letter in word:
        if letter in forbidLetters:
            return False
    return True

fin=open("words.txt")
forbidLetters = ("a","e","i","o","u")

for line in fin:
    word = line.strip()
    if isNotForbid(word,forbidLetters):
        print word