For describing something that moves slowly:
* -ly: This is the most common suffix for adverbs, creating words like "slowly."
* -ish: This suffix suggests a moderate degree of slowness, like "slowish."
* -paced: This indicates a slow rate of progress, like "slow-paced."
For describing something that is slow in other ways:
* -ness: This creates nouns like "slowness" to describe the quality of being slow.
* -ing: This creates a gerund like "slowing" to describe the act of becoming slow.
Other options:
* -footed: This describes something that moves slowly, like "slow-footed."
* -going: This describes something that proceeds at a slow pace, like "slow-going."
The best suffix to use will depend on the specific context and the intended meaning.