not having or bound by or held by a string or a thread.

not having a leader, guide or a manager.

unrestrained; not bound by moral or social rules.

not secured; not fixed; having no hopes of security.

not inclined to sleep; free from drowsiness; not induced by sleep.

wakeful; vigilant.

a man not induced by or not inclined to, sleep.

a wakeful, vigilant man.