Definify.com

Webster 1913 Edition

Adj.

Destitute of soil or mold.

Adj.

Destitute of soil.

soilless ‎(not comparable)

Lacking home soil; dispossessed
- 1910, Emma Goldman, “Anarchism: What It Really Stands For”, in Anarchism and Other Essays, 2005 ed. edition, ISBN 1595479716, page 37:
  If they live in squalor, in filth, in crime, with hope and joy gone, a homeless, soilless army of human prey.
Not containing soil
- 2007 October 4, Leslie Land, “Garden Q.&A.”, in New York Times:
  One popular recipe for a homemade version is two parts soilless mix like Pro-Mix and one part each vermiculite and perlite.