Qualitative terms:

Concentrated -- implies a relatively large amount of solute in the solution

Dilute -- implies a relatively small amount of solute in the solution

Saturated -- a solution that has as much dissolved solute as it can 'hold' (at a particular temperature) and that cannot dissolve more.

Unsaturated -- a solution that has less dissolved solute than it can 'hold' (at a particular temperature) and that can dissolve more.

Supersaturated -- an unstable solution that has more dissolved solute than it can 'hold' (at a particular temperature) and that will, given the opportunity, form two phases -- one of solute, and the other of saturated solution.

Miscible -- used when describing liquids to suggest that the liquids will form a solution.

Immiscible -- suggests that two liquids will not mix to form a homogeneous solution

Miscible in all proportions -- suggests that, no matter their relative amounts, two liquids will always form one solution. An example would be ethanol and water are miscible in all proportions.

There are numerous quantitative terms used to express the concentration of a solution.