superfast

adj, adv — 2 senses

adj

/ˈsupɚˌfæst/

Etymology From super- + fast.

Extremely fast.

The plane's large rear doors swallowed up my friend in superfast time, its departure sandblasting everyone in red prop wash as it vaporised down the main street and into the afternoon's dust-bowl sky.2005, Paul Carter, Don't Tell Mum I Work on the Rigs, Crows Nest: Allen and Unwin, page 23:

adv

Etymology From super- + fast.

At extremely high speed.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.