clayey

From Middle English cleyy, cleyye (“clayish; messy; unclean”) [and other forms], either: * from Middle English clei, cley (“clay; clayey soil; clay-containing material used as mortar or plaster”) [and other forms] + -i (suffix forming adjectives); clei, cley is derived from Old English clǣġ (“clay”), ultimately from Proto-Indo-European *gleh₁y-, *gley- (“to smear; to stick; glue; putty”); or * from Old English clǣig (“clayey”), from clǣġ (“clay”) (see above) + -iġ (suffix forming adjectives). The English word is equivalent to clay + -ey (suffix forming adjectives with the sense ‘having the quality of’), with the -e- included to avoid the occurrence of -yy. Sense 4 (“of the human body, as contrasted with the soul”) may allude to the biblical account of God creating man from earth; see Genesis 2:7 (King James Version; spelling modernized): “And the Lord God formed man of the dust of the ground, and breathed into his nostrils the breath of life, and man became a living soul.”

来源：wiktionary