This word is acceptable for play in the UK dictionary that is being used in the following games:

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adj. Alternative spelling of unmistakable.

"She was with the King when they heard what she called the unmistakeable whirr-whirr of a German plane flying at great speed."

clear    obvious   

clear    plain    obvious    evident   

breakable    unbreakable    unshakable    unshakeable   

definite    faint    distinctive    sudden    ominous