the GNU version of the Collaborative International Dictionary of English
adj. Partaking of the nature of clay, or containing particles of it.
The Century Dictionary and Cyclopedia
Partaking of the nature of clay, or containing particles of it: as, “clayish water,”
Word Usage
"One thing I did learn by experience with lavender in my garden is that they hate having "wet feet" so, with clayish soil, add loads and loads of fine gravel to improve the drainage."