Glossary
Negative Prompt
Words and concepts you want the model to actively avoid in the output.
Negative prompts are anti-prompts. Add 'blurry, deformed hands, watermark, text, low quality' to almost every render to filter the most common Stable-Diffusion artefacts. Flux requires much shorter negative prompts than SDXL because of how it's trained.
Synexa includes a one-click Negative Prompt Builder that picks the right defaults per model.