-ful (full of)
-ful
Full of; having.
The garden looked colourful after the monsoon rain.
Hopeful
Full of hope.
Aarav felt hopeful that the rain would stop before the picnic.
Beautiful
Very pleasing to see or hear.
The beach at Kochi looked beautiful at sunset.
Remember: Full drops an l to become -ful: hope + ful = hopeful. A y after a consonant turns to i: beauty → beautiful, plenty → plentiful.