“Согласен” means “I agree”. When some person tells you his or her opinion, and you disagree, you can respond this way. If you remember, “не” is a formal way of saying no in Russian.
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Translation: yes no; but no; not really. Meaning: No no (emphatic); no, I don't think so (unsure); not at all (emphatic); not really (conversational). The "no" that has always confused Russian learners, this is a very versatile way to disagree and can be used in various situations, including formal and informal settings.
Meaning: Stop it; yeah, right; oooooh kay; no need for that; there is no need.