Definition: lacking definition or definite content
Usage: nebulous reasons; unfixed as were her general notions of what men ought to be- Jane Austen
Similar words: indefinite
Definition: vague or not clearly defined or stated
Usage: must you be so indefinite?; amorphous blots of color having vague and indefinite edges; he would not answer so indefinite a proposal
Synonyms: nebulose, nebulous, cloudy
Definition: lacking definite form or limits
Usage: gropes among cloudy issues toward a feeble conclusion- H.T.Moore; nebulous distinction between pride and conceit
Similar words: indistinct
Definition: not clearly defined or easy to perceive or understand
Usage: indistinct shapes in the gloom; an indistinct memory; only indistinct notions of what to do