Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointment

I seldom find a word I look up included; about 90% of the time I have to go to another, more complete dictionary. That is disappointing. I also find it hard to enter the letters, they often don't register as the touch board is too flexible. For reading on the fly it doesn't work, a hard surface is needed. So I mostly don't bother. Shame, as it's a good idea - it really bugs me to read a word and not be able to know its meaning!