What is the opposite of French word commencer in French?

The opposite of "commencer" (to begin) in French depends on the context, but here are a few possibilities:

* Finir: This is the most general opposite, meaning "to finish" or "to end."

* Arrêter: This means "to stop" or "to cease."

* Terminer: This means "to complete" or "to finish" and is similar to "finir" but can sometimes imply a more formal or complete conclusion.

* Cesser: This is similar to "arréter" but can have a stronger sense of finality and permanency.

* Interrompre: This means "to interrupt" or "to break off," implying a temporary cessation.

The best opposite will depend on the specific situation and the nuance you want to convey.