1. Profit; advantage.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• fainfulness,
• vainfulness,
• bainfulness,
• hainfulness,
• yainfulness,
• gzinfulness,
• gsinfulness,
• gwinfulness,
• gqinfulness,
• gaunfulness,
• gajnfulness,
• gaknfulness,
• gaonfulness,
• ga9nfulness,
• ga8nfulness,
• gaibfulness,
• gaimfulness,
• gaijfulness,
• gaihfulness,
• gaindulness

• dankness,
• liveliness,
• gracefulness,
• plainness,
• gainings,
• painfulness,
• gayness,
• Gainful,
• faintness,
• watchfulness.

The adjective form of the word "Gainfulness" is "gainful".

The plural of the "Gainfulness" can be the "gainfulnesses".

The singular of the "Gainfulness" can be the "Gainfulness".