1. Political tendency which, in the European context, sits firmly in the middle of the spectrum, without any strong political ideology. Synonymous with "middle-of-the-road". American liberals are considerably to the right of their European counterparts.
"A woolly liberal", "a wet liberal"
2. Theological tendency, synonymous with Modernist, opposite to Conservative or Fundamentalist.
3. An ill-defined term, often abusive, which provokes violent and hysterical reactions from Americans.