EXTREMELY EXCITED can be described by three crossword solutions: ATWITTER (8 letters), AGOG (4 letters), and AFIRE (5 letters). ATWITTER is an adjective meaning 'in a state of nervous excitement or agitation'. AGOG is an adverb meaning 'eagerly interested or excited'. AFIRE is an adjective meaning 'filled with enthusiasm or excitement'. Together, these words describe someone who is extremely excited and filled with enthusiasm.