1.
If you describe something as infinite, you are emphasizing that it is extremely great in amount or degree.
...an infinite variety of landscapes...
The choice is infinite.
ADJ [emphasis]
• infinitely
His design was infinitely better than anything I could have done.
ADV: ADV adj/adv
2.
Something that is infinite has no limit, end, or edge.
Obviously, no company has infinite resources.
ADJ
• infinitely
A centimeter can be infinitely divided into smaller units.
ADV: ADV with v