If
kiy (kee)
very widely used as a relative conjunction or adverb; often largely modified by other particles annexed
Cain
Qayin (kah'-yin)
Kajin, the name of the first child, also of a place in Palestine, and of an Oriental tribe -- Cain, Kenite(-s).
shall be avenged
naqam (naw-kam')
to grudge, i.e. avenge or punish -- avenge(-r, self), punish, revenge (self), surely, take vengeance.
sevenfold
shib`athayim (shib-aw-thah'-yim)
seven-times -- seven(-fold, times).
truly Lamech
Lemek (leh'-mek)
Lemek, the name of two antediluvian patriarchs -- Lamech.
seventy
shib`iym. (shib-eem')
seventy -- seventy, threescore and ten (+ -teen).
and sevenfold
sheba` (sheh'-bah)
a primitive cardinal number; seven (as the sacred full one); also (adverbially) seven times; by implication, a week; by extension, an indefinite number
