Mixed or compounded in due proportion; worked up to a suitable consistency.

Of clay: not very plastic.

(un-, prefix1 affix 1.)

Of earth, esp. clay: worked with water to form a watertight material (cf. puddle, v. 4a); spec. made into puddle (puddle, n. 3b). Also: lined with…

(of clay) becoming white when fired.

Of wet clay: that has been wedged to expel air-bubbles before it is worked.