(obsolete) Cunning, craftiness. / (obsolete) A cunning scheme; a trick, a con. / Excessive refinement of argument; casuistry. / A convoluted or refined argument. / Fineness; subtlety.

Obsolete form of subtle; sly, artful, cunning

(obsolete) subtle

(transitive) To make subtle; to make thin or fine; to make less gross or coarse. / (transitive) To refine; to spin into niceties. / (intransitive) To use subtle arguments or distinctions.

Third-person singular simple present indicative form of subtilize

simple past tense and past participle of subtilize

present participle of subtilize

Obsolete form of subtly.

plural of subtilism

(archaic) The quality or state of being subtile.