ultrahigh speed; ultrafast
extreme height; high-rise (i.e. building)
ultra-high sensitivity; supersensitivity; extreme sensitivity
ultra-high vacuum; UHV; extremely high vacuum; XHV
super-aged society; superannuated society
extreme population aging (ageing)
ultrahigh load-carrying capacity; ultrahigh load capacity
ultra-luxury; super high-class
ultra-high pressure; super-high pressure; extra-high voltage; ultra-high voltage; supervoltage