waver russian
дро́гнуть
shiver, be chilled, shake, quaver, move, waver, falter, flinch
колеба́ться
to hesitate/to range/fluctuate, vacillate, waver
заколеба́ться
begin to hesitate, become unsteady, begin to waver
ша́ткий
unsteady, shaky, rickety, precarious, wavering, weak
продро́гнуть
shiver, be chilled, shake, quaver, move, waver, falter, flinch