Adjective
poorly stated or described
Source: WordNetProse may carry a load of ill-defined matters like a ship. But poetry is the machine which drives it, pruned to a perfect economy. William Carlos Williams
So much of adolescence is an ill-defined dying, An intolerable waiting, A longing for another place and time, Another condition. Theodore Roethke
he confuses the reader with ill-defined terms and concepts Source: Internet
Authoritarian dictatorships are those where there is little political mobilization and "a small group exercises power within formally ill-defined limits but actually quite predictable ones". Source: Internet
And conversely, when momentum (and thus wavelength) is relatively well defined, the wave looks long and sinusoidal, and therefore it has a very ill-defined position. Source: Internet
Bell's optimistic and naive Eleanor is a fine enough fish-out-of-water character, but the line between what she knows and what she doesn't about the modern world is ill-defined to the point that it becomes distracting. Source: Internet