From etymonline.comfrom Ger. Ambivalenz, coined 1910 by Ger. psychologist Eugen Bleuler (on model of equivalence, etc.) from L. ambi- "both" + valentia "strength," from prp. of valere "be strong" (see valiant).
Adjective: ambivelent
Many people become ambivelent when it come to life changing decisions.