WordNet sense 1 (someone who flees from an uncongenial situation):

runaway, fleer

WordNet sense 2 (someone who is sought by law officers; someone trying to elude justice):

fugitive from justice

WordNet sense 3 (lasting for a markedly brief time):

fleeting, momentary, momentaneous

WordNet sense 4 (primarily temporal sense; indicating or being or seeming to be limited in duration):

short