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