THESAURUS
subtilize
adulterate, analyze, attenuate, contradistinguish, cut, demarcate, demark, dematerialize, differentiate, dilute, discriminate, disembody, distinguish, divide, draw the line, emacerate, emaciate, enervate, etherealize, expand, mark the interface, pick out, rarefy, sap, screen, screen out, segregate, select, separate, set a limit, set apart, set off, sever, severalize, sieve, sieve out, sift, sift out, sort, sort out, spiritualize, split hairs, subdivide, thin, thin away, thin down, thin out, water, water down, weaken, winnow
ROGET THESAURUS
subtilize
Rarity
VB
rarefy, expand, dilate,
subtilize.
& Sophistry
VB
judge intuitively, judge by intuition, hazard a proposition, hazard a guess, talk at random, reason ill, falsely, misjudge, paralogize, take on faith, take as a given, assume (supposition), pervert, quibble, equivocate, mystify, evade, elude, gloss over, varnish, misteach, mislead, cavil, refine,
subtilize, split hairs, misrepresent, beg the question, reason in a circle, reason in circles, assume the conclusion, cut blocks with a razor, beat about the bush, play fast and loose, play fast and loose with the facts, blow hot and cold, prove that black is white and white black, travel out of the record, parler a tort et a travers, put oneself out of court, not have a leg to stand on, judge hastily, shoot from the hip, jump to conclusions (misjudgment).