Our new managing director has reorganized the company a little bit, but nothing has fundamentally changed/altered (= its basic character has not changed).
I disagree fundamentally with what you're saying.
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(Definition of “fundamentally” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a short pole with a wide, flat part at one end or both ends, used for moving a small boat or canoe through the water