naku NAKU cmavo-compound

(adverbial) bridi contradictory negator; "it is not true that...."; negates the bridi as well as any other adverbial or quantifier located on its right.

On grammatical class:

ja'aku (comp!)
(adverbial) bridi logical affirmer; "it is true that...."; affirms the bridi as well as any other adverbial or quantifier located on its right.
naku (comp!)
(adverbial) bridi contradictory negator; "it is not true that...."; negates the bridi as well as any other adverbial or quantifier located on its right.

In notes:

na'ei (exp!)
Contradictory negation of a predicate
adverbi
x1 is an adverbial adjunct (adverb or adverbial clause) meaning x2 in language x3