subjective

If Spain in the 1930s may look racially homogeneous from our supposedly enlightened point of view, Kaufman indirectly makes the point that such definitions are always subjective, and subject to historical revision.

"It's very difficult, it's very subjective," he says.

This is one of the most complex and highly subjective parts of the law.

Everything is too subjective to each individual incident, which means the referee's interpretation takes centre stage.

Ultimately, these are subjective questions on which opinions will vary.