Suffixes:
* -ish: This suffix can add a vague sense of something resembling the base word. For example, "creepish" could imply someone who is vaguely unsettling or gives off creepy vibes.
* -y: This suffix can indicate a quality or characteristic, and can be used to create words like "creepy" itself.
Descriptive words:
* Creepily: This adverb emphasizes the way someone acts in a creepy manner.
* Creeping: This word describes the action of moving slowly and stealthily, which can be associated with creepy behavior.
* Unnerving: This word means causing a feeling of anxiety or unease, which aligns with the feeling of creepiness.
* Eerie: This word describes something unsettling or strange, which can also be used to describe a person who is creepy.
Ultimately, the best way to describe someone as "like a creep" depends on the specific context and the nuance you want to convey.