Feasibility : the state or degree of being easily or conveniently done.Unsuitability : the quality of being inappropriate, unsuitable, or unfit.Impracticability : not practicable : incapable of being performed or accomplished by the means employed or at command an impracticable proposal.Impropriety : failure to observe standards of honesty or modesty; improper behaviour or character.Cheapness : the quality of being low in price, especially in relation to similar items or services.Antonym of Feasibility is Impracticability