The word "不仅仅" is formed through a process of deliberate, emphatic repetition where the core negating character "不" (not) is tripled, with the second and third instances being joined by "仅" (only). This structure creates a layered, cumulative effect of negation, moving from a simple "not" to a reinforced "not only" and finally to an even stronger, more comprehensive denial of limitation, essentially building intensity and scope through the restatement and binding of its fundamental unit.