gran ‧ dil ‧ o ‧ quent /ɡrænˈdɪləkwənt/ BrE AmE adjective formal
[ Date: 1500-1600 ; Language: Latin ; Origin: grandiloquus , from grandis ( ⇨ ↑ grand 1 ) + loqui 'to speak' ]
using words that are too long and formal in order to sound important SYN pompous
—grandiloquence noun [uncountable]