A weakness or undesirable characteristic; con; drawback.
The disadvantage to owning a food processor is that you have to store it somewhere.
A setback or handicap.
My height is a disadvantage for reaching high shelves.
1859-1890, John G. Palfrey, History of New England to the Revolutionary War
Abandoned by their great patron, the faction henceforward acted at disadvantage.
Loss; detriment; hindrance.
verb
(transitive) To place at a disadvantage.
They fear it might disadvantage honest participants to allow automated entries.