What is the difference between boundless and unlimited?

Answer 1

The terms boundless and unlimited are extremely similar. Only habitual usage distinguishes them. For example, if you are very enthusiastic you are more likely to be said to have boundless enthusiasm, than unlimited enthusiam, but if you have been given the opportunity to spend as much money as you like, that would be described as an unlimited expense account rather than a boundless expense account. This is just a matter of habit, more than a meaningful distinction.