大失所望

greatly disappointed

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

actually / place / classifier for houses, small buildings, institutions etc / that which / particle introducing a relative clause or passive / CL:個|个[ge4]

to lose / to miss / to fail

full moon / to hope / to expect / to visit / to gaze (into the distance) / to look towards / towards

15th day of month (lunar calendar) / old variant of 望[wang4]