Meaning of -FUL in English

-FUL

I. -ful 1 /f ə l/ AmE suffix [in adjectives]

1 . full of something:

an eventful day

2 . having the quality of something or causing something:

restful colours

Is it painful?

—-fully /f ə li/ suffix [in adverbs] :

shouting cheerfully

II. -ful 2 /fʊl/ AmE suffix [in nouns]

1 . the amount of a substance needed to fill a particular container:

two cupfuls of milk

2 . as much as can be carried by or contained in a particular part of the body:

an armful of flowers

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.