barely · only · merely · only (this and nothing more)

We can't just fire Tom.

I was just talking about Tom.

Not wanting to is the reason; not being able to is just an excuse.

Instead of just the marketing department completing all their work objectives is not as effective as all the departments working together and mutually realising all the objectives.

From that day forth he merely tasted his food, and only just moistened his lips with drink.