General Discouragement:
* Discouragement: This is the most straightforward option, but it is somewhat general.
* Disheartening: This refers to something that causes discouragement.
* Dejection: This implies a feeling of low spirits or sadness.
* Disillusionment: This indicates a loss of faith or hope in something.
Specific Instances of Discouragement:
* Deterrent: This refers to something that discourages or prevents a particular action.
* Obstacle: This refers to something that hinders or prevents progress.
* Setback: This refers to an event that causes a temporary delay or difficulty.
Other Options:
* Discouragement factor: This is a more formal way of referring to something that discourages people.
* Dissuasion: This refers to the act of persuading someone not to do something.
The best noun to use will depend on the specific context and the meaning you want to convey.