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de‧cid‧ed‧ly

1 [+ adjective/adverb] definitely or in a way that is easily noticed :
Cole's style is decidedly more formal than the previous manager's.
Cole's style is decidedly more formal than the previous manager's.2 British English written in a way that shows that you are very sure about a decision :
'I'm not going to do it,' said Margaret decidedly.
'I'm not going to do it,' said Margaret decidedly.