infrahuman /in-frə-hūˈmən/

Lower than human (also noun)

• underboughs
• underbought
• under-boy
• under-boys
• underbreath
• underbreaths
• underbred
• underbridge
• underbridges
• underbrush
• underbrushed
• underbrushes
• underbrushing
• underbudget
• underbudgeted
• underbudgeting
• underbudgets
• underbuild
• underbuilder
• underbuilders
• underbuilding
• underbuilds
• underbuilt
• underburnt
• underbush