good-for-nothing

noun

A self-indulgent person who spends time avoiding work or other useful activity: bum¹, drone¹, fainéant, idler, layabout, loafer, ne'er-do-well, no-good, slugabed, sluggard, wastrel. Informal do-little, do-nothing, lazybones, slug². Slang slouch. See industrious/lazy.

adjective

Lacking all worth and value: drossy, inutile, no-good, valueless, worthless. Informal no-account. Slang nothing. See value/worthlessness/evaluation.

Definition: person who is idle, worthless
Antonyms: hard worker

The noun has one meaning:

Meaning #1: an idle worthless person
  Synonyms: goldbrick, goof-off, ne'er-do-well, good-for-naught

The adjective good-for-nothing has one meaning:

Meaning #1: without merit
  Synonyms: good-for-naught, meritless, no-account, no-count, no-good, sorry