WordWeb Online

1. Not firmly placed or set or fastened
    
2. Lacking definition or definite content
   "unfixed as were her general notions of what men ought to be"
   - nebulous

1. To make fluid; to dissolve
    
2. To loosen from a fastening; to detach from anything that holds; to unsettle; as, to unfix a bayonet; to unfix the mind or affections

See also: detached, floating, free, indefinite, insecure, unfirm, unsteady

Antonym: fixed