dayful noun 2adjective 1forms 4 noun2 •The amount (of something) that fills or is produced in a day.Pure half hours in which people can really rest or really talk are worth whole dayfuls of words tossed out and never caught. — 1984 •A tiring day.But it was only one situation in a playful dayful where baby had to be entertained, not only for her own sake, but for the sake of the self-preservation of the family. — 1959 adjective1 •(literary) Pertaining to daytime and a day's activities.They glitter the closemouths, psalmody the stones with suntastic steps of dayful ignition. — 1954 formsdayfuls · daysful · more dayful · most dayful