chinful adjective 1noun 1forms 4 adjective1 •Having a noticeable chin.The low-brow and square-face, The long Bartlett pear-face, The chinless and chinful, The grinless and sinful. — 1924 noun1 •An amount that covers the chin.They semi-roughed it near Dwyer, Ontario and came home with a deer, some tall tales about life in the wilds and four chinsful of whiskers. — 1960 formschinfuls · chinsful · more chinful · most chinful