The adjective “idle” can be used for a person who we think is lazy and doesn’t want to do any work, or be productive.
If you think someone is extremely lazy, you can also say they’re “bone idle”, which has a stronger meaning.
She’s bone idle. There’s a huge pile of work to be done, but she just sits on her phone all day.
The noun form is “idleness”, which isn’t as common as idle.