Adjective
helpfull (comparative more helpfull, superlative most helpfull)
Archaic spelling of helpful.
"Acetone can prove to be really helpfull in restoring back the chemical composition of a nailpolish!" Source: Internet
The first book was very good, really helpfull. Source: Internet
Typescript is very helpfull to manage javascript project. Source: Internet
US Navy Official Web Site Lot of good and helpfull information about the US Navy. Source: Internet