As adjectives the difference between unlimited and free
is that
unlimited is limitless or without bounds; unrestricted while
free is (
label) unconstrained.
As an adverb free is
without needing to pay.
As a verb free is
to make free; set at liberty; release; rid of that which confines, limits, embarrasses, or oppresses.
As a noun free is
(australian rules football|gaelic football) abbreviation of free kick.