The morpheme -aatu is a `portmanteau morph' that functions both as a neuter and the future negative and, like maatt-, is attached to the infinitive.
Çâ ÂÀÔâ adu varaadu `it won't come'
The Ç -a of the infinitive is deleted before Èâ -aadu. Note that this negative is not a HABITUAL negative; since the future positive form is identical with the habitual form (e.g., ÇÂ Ø½ÔÂÔ ava poovaa means both `she will go' or `she would habitually go', `she used to go'), it is important to note that the negative of the habitual is formed by a different process. (Cf. § 6.12 for the form used to express habitual negative action.)