fugitive
/ˈfjuːdʒɪtɪv/noun
1- a person who has escaped from a place or is in hiding, especially to avoid arrest or persecution逃亡者, 亡命者：
fugitives from justice
逃犯
as modifier fugitive criminals.逃犯。
1.1
- as modifier figurative quick to disappear; fleeting〈喻〉转瞬即逝的, 易消失的; 短暂的：
he entertained a fugitive idea that Bella needed him.
他想贝拉会需要他, 但这念头稍纵即逝。
词源
late Middle English: from Old French fugitif, -ive, from Latin fugitivus, from fugere 'flee'.