of Translation Studies SI - 1000 Ljubljana , A ? ker ? eva 2 aljosav @ gmail.com Abstract We report on a series of experiments aimed at improving the machine translation of ambig-uous lexical items by using wordnet-based unsupervised Word Sense Disambiguation ( WSD ) and comparing its results to three MT systems . Our experiments are performed for the English-Slovene language pair using UKB , a freely available graph-based word sense disambiguation system .