P. T. Barnum

Politeness and civility are the best capital ever invested in business. Large stores, gilt signs, flaming advertisements, will all prove unavailing if you or your employees treat your patrons abruptly. The truth is, the more kind and liberal a man is, the more generous will be the patronage bestowed upon him.

American Entertainer

Unavailing conveys that actions have failed to achieve their goal.

Negative Outcome

'Unavailing' often suggests disappointment or frustration over ineffective actions.

Emotional Weight

Don't confuse 'unavailing' with 'unavailable'; they have different meanings.