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Disproportionate
Relative Size
Use 'disproportionate' to emphasize that one thing is much bigger or smaller than it should be compared to another. 
Negative Connotation
'Disproportionate' often implies something is unfair or not right, so use it to criticize. 
Visual Imagery
Imagine one side of a scale heavily weighed down to help remember the meaning of 'disproportionate'. 