n. an act of hindering someone's plans or efforts. Syn. -- frustration, thwarting, foiling. [ WordNet 1.5 ]
adj. 1. preventing realization or attainment of a desire; causing frustration. Syn. -- frustrative, thwarting. [ WordNet 1.5 ]
2. discouraging. Opposite of encouraging. Syn. -- disappointing. [ WordNet 1.5 ]