Joyful

Base- Joy

Joy- A feeling of great pleasure and happiness

Suffix- Ful

Ful- Full of

Noun- Joyful

Full of joy
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I have never been so joyful.

Creating a new word

The word ful is full of so putting any adjective before that will be full of... To make the word Joyful putting the word joy in front of ful makes it full of joy.