Idiom be an unknown quantity Theme: PERSONALITY to be a person or thing about which no one is certain.John is an unknown quantity. We don't know how he's going to act.The new clerk is an unknown quantity. Things may not turn out all right.
idiombe an unknown quantityused in order to say that nobody knows what someone or something is like or what effect they will have on your situation:The new healthcare arrangements are an unknown quantity, and may not be favorable to people with long-term illnesses.Chan's opponent tomorrow will be Cook, who is still a bit of an unknown quantity, but has done very well in the tournament so far.
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