The Collaborative International Dictionary of English v.0.48:
loamless \loamless\ adj. having no loam; -- of soil; as, a stony loamless yard. Contrasted with loamy. [WordNet 1.5]WordNet (r) 3.0 (2006):
loamless adj 1: having no loam; "a stony loamless yard" [ant: loamy]