I. ˈslakə(r) noun
( -s )
: one that slacks: as
a. : a drawgate in a sluice
b. : a person who shirks work, responsibility, or an obligation ; especially : one that evades military service in time of war
II. noun
: a person and especially a young person who is perceived to be disaffected, apathetic, cynical, or lacking ambition
• slacker adjective