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Webster 1913 Edition

Adj.

Not being, or having, matter;

as,

matterless

spirits

Davies (Wit’s Pilgr.).

Unimportant; immaterial.

[Obs.]

Adj.

Void of matter.

matterless ‎(not comparable)

Without matter, void of matter
unimportant, irrelevant.
- 2009, John McGahern, That They May Face the Rising Sun
  It's propped against a jug, but all that is matterless now.