(ちょう)

ちょう
prefix
super-; ultra-; extremely
quantity
1. super-; ultra-; extremely
Productive prefix meaning 'super-' or 'ultra-'. In compounds it conveys exceeding the normal or expected level, while in casual speech it works as an intensifier roughly equivalent to 'super' or 'really'.
Today was super fun.
Super-express trains are faster than regular express trains.
I hear she married an ultra-famous actor.

Originally a Sino-Japanese prefix in formal compounds (超音速(ちょうおんそく) 'supersonic', 超大国(ちょうたいこく) 'superpower'). Since the 1980s also widely used as a casual intensifier attached freely to adjectives and even verbs ((ちょう)かわいい, (ちょう)(いそが)しい).

Formal compounds

Casual usage

In casual speech, (ちょう) feels more youthful than すごく or とても and is common among younger speakers.