Synonyms of 'imbalance'
the imbalance between the two sides in this war
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Bias is a tendency to prefer one person or thing to another, and to favour that person or thing.
There were fierce attacks on the BBC for alleged political bias.
A disproportion is a state in which two things are unequal.
There is a disproportion in resources available.
Thesaurus for imbalance from the Collins English Thesaurus
If there is an imbalance in a situation , the things involved are not the same size , or are not the right size in proportion to each other.