Answer
absence or deprivation of advantage or equality. the state or an instance of being in an unfavorable circumstance or condition: to be at a disadvantage. something that puts one in an unfavorable position or condition: His bad temper is a disadvantage.
Difference
As nouns the difference between disadvantage and advantage
is that disadvantage is a weakness or undesirable characteristic; a con while advantage is any condition, circumstance, opportunity or means, particularly favorable to success, or to any desired end.