- 1in every way that is important; completely The two approaches are fundamentally different. By the 1960s, the situation had changed fundamentally. They remained fundamentally opposed to the plan.
- 2used when you are introducing a topic and stating something important about it synonym basically Fundamentally, there are two different approaches to the problem.
- 3used when you are saying what is the most important thing about someone or something synonym basically She is fundamentally a nice person, but she finds it difficult to communicate.
Check pronunciation: fundamentally