Dictionary:

graceless

  (grās'lĭs)

1. Lacking grace; clumsy.
2. Having or exhibiting no sense of propriety or decency.
3. Inferior or clumsy in treatment or performance: a graceless production of the play.

adjective

Lacking dexterity and grace in physical movement: awkward, clumsy, gawky, inept, lumpish, maladroit, ungainly, ungraceful. Slang klutzy. Idioms: all thumbs. See ability/inability.

Definition: clumsy, unsophisticated
Antonyms: beautiful, charming, dexterous, elegant, graceful, sophisticated

The adjective has 3 meanings:

Meaning #1: lacking graciousness
  Synonym: unpleasing

Meaning #2: lacking grace; clumsy
  Synonym: ungraceful

Meaning #3: lacking social polish
  Synonyms: gauche, unpolished