By reduplication, from talal through the idea of vibration; a trailing bough (as pendulous) -- bushy.
see HEBREW talal
H8534. taltallim
תַּלְתַּלִּים noun feminine (?)
plural as figurative of woman's locks, meaning dubious: ת ׳קְוֻצּוֺתָיו כָּעורֵב שְׁחרוֺת Song of Solomon 5:11; Thes (from above v) waving palm-branches, ᵐ5 ἐλάται; Late Hebrew once, figurative, LevyNHWB iv. 649 high hills compare JastrDict 1674 heaps, piles; but MagnusHohes Lied and JacobStud. Arab Dichter iv. 21 envelope or sheath of spadix of date-palm (with which hair often compare in Arabic poetry JacobIb. iii. 46 f, compare Arabic drinking vessel made of this envelope Lane); so perhaps Assyrian taltallu DlHWB 708.