profitless 10 Associations

unprofitable unrewarding (similar term)

thankless 9 Associations

unappreciated ungratifying unrewarding (similar term)

unappreciated 13 Associations

thankless ungratifying unrewarding (similar term)

ungratifying 12 Associations

thankless unappreciated unrewarding (similar term)

unprofitable 12 Associations

profitless unrewarding (similar term)