GAINFUL

gainful, paid, paying

(adjective) yielding a fair profit

Source: WordNet® 3.1

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Etymology 1

Adjective

gainful (comparative more gainful, superlative most gainful)

Contrary.

Disposed to taking advantage of.

Troublesome; fractious; hard to handle.

Etymology 2

Adjective

gainful (comparative more gainful, superlative most gainful)

Providing gain; profitable.

Source: Wiktionary

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Gain"ful, a.

Definition: Profitable; advantageous; lucrative. "A gainful speculation." Macaulay.

– Gain"ful*ly, adv.

– Gain"ful*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition

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