English Theasurus that shows all the ways the English word is translated from the original Greek and Hebrew.
English Theasurus from the Hebrew and Greek Strong's Dictionary
sincere 0097 ** adolos ** {sincere}.
sincere 1506 ** eilikrines ** pure, {sincere}.
sincerely 0055 ** hagnos ** {sincerely}.
sincerely 8549 -- tamiym -- without blemish, complete, full, perfect, {sincerely}(-ity), sound, without spot, undefiled, upright(-ly), whole.