Ghafil means Reckless/ Negligent
Given below is a couplet which explains the meaning of the word:
Sair kar Duniya ki Ghafil zindagaani phir kahan?
Zindagi gar kuch rahi toh yeh jawani phir kahan?
Khawaja Meer Dard
Travel the world oh reckless there is no certainty of life,
even if you do live a long enough there is no certainty of youth