shapeless
1. [ adjective ] having no definite form or distinct shape
Synonyms: amorphous formless
Examples:

"amorphous clouds of insects" "an aggregate of formless particles" "a shapeless mass of protoplasm"

Related terms: unformed
2. [ adjective ] lacking symmetry or attractive form
Examples:

"a shapeless hat on his head"

Related terms: unshapely
Similar spelling:   shapelessly
  shiplaster