le vain

The French adjective "vain" means "vain" or "useless" when describing an action or effort—something done without result or purpose, essentially "futile." For example, "un effort vain" means "a vain effort," an effort that did not succeed.

Meanings and usage:

1. Futile, useless, unsuccessful – describing attempts or actions that lead nowhere.
2. Proud, self-important – in older or literary contexts, "vain" can describe a person full of vanity (similar to "vain" in English).

Synonyms and differences:

• Vain vs. Inutile: While both mean "useless," "inutile" is more neutral, simply meaning something has no use or benefit. "Vain" emphasizes failure despite effort or expectation.
• Vain vs. Vaniteux: "Vaniteux" refers specifically to a vain or conceited person focusing on their appearance or merits. "Vain" as adjective typically stresses futility rather than pride, except in literary or figurative sense.
• Vain vs. Fâcheux: Sometimes misleading, as "fâcheux" means "unfortunate" or "annoying" rather than "vain."

Example sentence:

• "Tous ses efforts furent vains." ("All his efforts were in vain.")
• "Elle est si vaniteuse qu'elle passe son temps devant le miroir." ("She is so vain/conceited that she spends her time in front of the mirror.")

Summary: "Vain" primarily conveys uselessness or futility in modern French, but in older or literary language, it can describe vanity similar to the English word "vain."