Literally, from the Greek, 'nowhere', 'no place': Title introduced by
Thomas More for a description of a state he considered ideal.
Since then the term 'utopia' has
often been used for similar descriptions of ideal states, of which there
have been quite a few, and as the adjective 'utopian' to qualify
political plans, usually in the sense that even if the plan sounds well
and would desirable if widely practised, in fact it is impracticable,
usually because human beings are on average not much like the utopian
planner conceived them to be.
And indeed, one main constraint on all political plans and
proposals, especially including the more utopian and idealist ones, is
that in terms of their very own moral norms most human beings
have been immoral most of the time, and practised what they preached
only if doing so came with little risk and little costs to themselves.