The word "不偏不倚" is formed by sequentially using the negation character "不" (meaning "not") twice, each time directly modifying a character that denotes a type of deviation: first "偏" (meaning biased or partial), then "倚" (meaning leaning or inclined). This results in two parallel negated phrases, "不偏" and "不倚", that are concatenated to create a single four-character unit, literally expressing "not biased, not leaning" to convey impartiality.