-ful

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ful

▶suffix

• 1 (forming adjectives from nouns) full of; having the qualities of: sorrowful.

• 2 forming adjectives from adjectives or from Latin stems with little change of sense: grateful.

• 3 (forming adjectives from verbs) apt to; able to; accustomed to: forgetful.

• 4 (pl. -fuls) forming nouns denoting the amount needed to fill the specified container: bucketful.