Meaning of -FUL in English

■ 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》 ( plural ~s ) forming nouns denoting the amount needed to fill the specified container: bucketful.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.