† ˈcounterˌstrengthObs. [counter- 2, 3.] Opposing strength or force; resistance. 1579Fenton Guicciard. (1618) 2 To make a counterstrength against the might of the Venetians..he iudged it necessarie to allie himselfe with others.1611Cotgr., Contrecarre, a counterstrength, opposition, resistance, defence.