Onomatopoeia

ニコニコ someone smiling happily

ワクワク someone who is bursting with excitement in anticipation of something

イライラ someone who is irritated/angry because things are not going as desired

モジモジ someone behaving nervously/bashfully and unable to do what they want

ムシムシ hot, humid, muggy weather

グズグズ sluggish, dillydallying behaviour. something that is uncertain. someone who is grumbling and complaning

ブラブラ a heavy object dangling and swaying. walking slowly without purpose

ドキドキ a pounding heart

ドンドン a continuous loud sound, something proceeding steadily

バラバラ things scattered about or broken up, the sound of hailstones falling

カンカン someone who is enraged

ホカホカ warm, delicious-looking food

ボロボロ something badly damaged, mentally and physically worn out

クルクル a small object spinning lightly

ギュウギュウ pushing or packing something as tightly/strongly as possible

ツルツル a surface that is smooth, sleek or slippery

ザーザー the sound of heavy rain or TV static

ウトウト somebody about to fall asleep, dozing

ガラガラ when there are few people somewhere, the sound of raw, hard material

ペラペラ someone chattering away frivolously, speaking fluently, the sound of leafing through a book

Klicka