mis·es·ti·mate
| \ ˌmis-ˈe-stə-ˌmāt
\
misestimated;
misestimating
transitive verb
: to estimate (something) wrongly
He reopens one of the epic disputes of the cold war, namely whether the C.I.A. misestimated Soviet military and economic strength in the 1970's …— Philip Taubman