sub·til·ize 
(sŭtl-īz′, sŭbtə-līz′)
(sŭtl-īz′, sŭbtə-līz′)v. sub·til·ized, sub·til·iz·ing, sub·til·iz·es
v.tr.
To render subtle: "I need to tell stories. I find new friends, new listeners, subtilize my lies" (Helen Yglesias).
v.intr.
To argue or discuss with subtlety; make fine distinctions.
sub′til·i·zation (-ĭ-zāshən) n.