disappoint
Concise Oxford English Dictionary © 2008 Oxford University Press:
disappoint/dɪsəˈpɔɪnt/
▶verb fail to fulfil the hopes or expectations of.
■ prevent (hopes or expectations) from being realized.
– derivatives
disappointing adjective,
disappointingly adverb.
disappointing adjective,
disappointingly adverb.
– origin ME (in the sense ‘deprive of a position’): from OFr. desappointer.
'disappoint' also found in these Oxford entries:

