calm, cool, and collective vs calm, cool, and collected : Common Errors in English

About calm, cool, and collective vs calm, cool, and collected

Unless you’re living in an unusually tranquil commune, you wouldn’t be “calm, cool, and collective.” The last word in this traditional phrase is “collected,” in the sense of such phrases as “let me sit down a minute and collect my thoughts.” If you leave out “cool” the last word still has to be “collected.”
Lightning fast vocabulary building for SAT, ACT, GRE, GMAT and CAT