experimental

Concise Oxford English Dictionary © 2008 Oxford University Press:
experimental/ɪksperɪˈmentl/

▶adjective

• 1 based on untested ideas or techniques and not yet established or finalized.

  ■ relating to scientific experiments.

• 2 (of art) radically new and innovative.

• 3 archaic based on experience as opposed to authority or conjecture.

– derivatives
experimentalism noun,
experimentalist noun,
experimentally adverb.