I. adjective suffix
(sometimes -fuller; sometimes -fullest)
Etymology: Middle English, from Old English, from full, adjective
1. full of <prideful> 2. characterized by <peaceful> 3. having the qualities of <masterful> 4. tending, given, or liable to <helpful> II. noun suffix number or quantity that fills or would fill <roomful>
New Collegiate Dictionary. 2001.