modified
recognizable, considerable, perceptible, discernible, measurable, sizable, goodly, good-sized, substantial, tangible, definite, estimable, ascertainable, calculable, visible, apparent, distinguishable, sensible, material, perceivable, evident, detectable, noticeable, significant, fairish*, not inconsiderable*, healthy*.
See syn. study at tangible.
Antonyms imperceptible, slight, inconsiderable.