Nouns

(n)fugitive, runaway, fleer1someone who flees from an uncongenial situation“fugitives from the sweatshops”
(n)fugitive, fugitive from justicesomeone who is sought by law officers; someone trying to elude justice

Adjectives

(s)fleeting, fugitive, momentaneous, momentarylasting for a markedly brief time“a fleeting glance”, “fugitive hours”, “rapid momentaneous association of things that meet and pass”, “a momentary glimpse”