暗涙[anrui] silent tears
暗涙に咽ぶ[anruinimusebu] to shed silent tears
感涙[kanrui] tears of gratitude
嬉し涙[ureshinamida] happy tears
空涙[soranamida] crocodile tears

血も涙も無い[chimonamidamonai] cold-blooded
血涙[ketsurui] tears of blood
紅涙[kourui] feminine tears
催涙ガス[sairuigasu] tear gas
催涙銃[sairuijuu] tear-gas gun