flabbergast /flabˈər-gäst/ (informal)

To stun or confound

• ultra vires
• ultra-virtuous
• ultroneous
• ultroneously
• ultroneousness
• ultroneousnesses
• ululant
• ululate
• ululated
• ululates
• ululating
• ululation
• ululations
• ulva
• ulvas
• ulyie
• ulzie
• um
• umami
• umamis
• um and ah
• Umayyad
• umbel
• umbellar
• umbellate