Longman Dictionary of Contemporary English - frustrated

~ adj 1 feeling annoyed, upset, and impatient, because you cannot control or change a situation, or achieve something  (get frustrated)  (He gets frustrated when he can't win.) + with/a  (I can't understand this. I just get frustrated with it. | sexually frustrated (=feeling dissatisfied because you cannot have sex)) 2 a frustrated poet/actor/dancer etc someone who wants to develop a particular skill but has not been able to do this