Definify.com
Webster 1913 Edition
Gainful
Gain′ful
,Adj.
Profitable; advantageous; lucrative.
“A gainful speculation.” Macaulay.
– Gain′ful-ly
, adv.
Gain′ful-ness
, Noun.
Webster 1828 Edition
Gainful
GA'INFUL
,Adj.
1.
Lucrative; productive of money; adding to the wealth or estate.