. Кова́рным
 Dative - Instrumental - Masculine - Neuter - Plural
(RUSV: 1 + NRT: 1) = 2
See also   (Смотрите Та́кже) :
 Proverbs 7:10 NRT
10 И навстре́чу ему́ вы́шла же́нщина,
10 And towards [him, it, to him] [came out, gone out] woman,
как блудни́ца оде́тая,
[how, what, as, like (comparison)] [the harlot, whore] одетая,
с се́рдцем кова́рным.
[and, from, in, of, with] [heart, with my heart] коварным.

And,
behold,
there met him a woman with the attire of an harlot,
and subtil of heart.
Proverbs 7:10 KJV
 Proverbs 7:10 RUSV
10 И вот навстре́чу к нему́ же́нщина,
10 And [behold, here, there] towards [to, for, by] [him, his] woman,
в наря́де блудни́цы,
[at, in, of, on] [attire, the outfit] [harlots, prostitutes],
с кова́рным се́рдцем,
[and, from, in, of, with] коварным [heart, with my heart],

And,
behold,
there met him a woman with the attire of an harlot,
and subtil of heart.
Proverbs 7:10 KJV