1. one cup (of); one glass (of); one bowl (of); cupful; glassful; bowlful; spoonful
2. one drink (of alcohol)
Adjective (な)
Adjective (の)
Suffix
Usually written in kana
3. full; filled (with); brimming (with); crowded; packed
心が不安でいっぱいになる。My heart becomes full of anxiety.
Adverb
Suffix
Usually written in kana
4. fully; to capacity; to the maximum; as much as possible
窓をいっぱいに開けた。I opened the window all the way.
Adverb
Usually written in kana
5. a lot; much; many
きっと、楽しいこともいっぱいあるよ。There will surely be lots of fun things too.
Adverb
Suffix
Usually written in kana
6. all of ...; the entire ...
これから午後いっぱい、彼の前で平気な顔で振る舞えるだろうか。Can I keep acting like nothing's wrong in front of him for the whole afternoon?
7. one (squid, octopus, crab, etc.)
8. one (boat)