pon·der 
(pŏndər)
(pŏndər)v. pon·dered, pon·der·ing, pon·ders
v.tr.
To think about (something) with thoroughness and care.
v.intr.
To reflect or consider with thoroughness and care.
[Middle English ponderen, from Old French ponderer, from Latin ponderāre, from pondus, ponder-, weight; see (s)pen- in the Appendix of Indo-European roots.]