Synonyms for Runaway (same or very similar meaning)
WordNet sense 1 (someone who flees from an uncongenial situation):
fugitive, fleerWordNet sense 2 (an easy victory):
blowout, romp, shoo-in, walkaway, laugherWordNet sense 3 (not being under control; out of control):
uncontrolledFrom the ODE community, based on WordNetadd/edit