weaker sex
Noun
Meaning
Used other than figuratively or idiomatically: see weaker, sex.
(now offensive) Women; the female gender.
Source: en.wiktionary.orgSynonyms
Examples
Most men act so tough and strong on the outside because on the inside, we are scared, weak, and fragile. Men, not women, are the weaker sex.
To call woman the weaker sex is a libel; it is man's injustice to woman.
Men are actually the weaker sex.