Synonyms of 'secondly'
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You can use also to give more information about a person or thing, or to add another relevant fact.
She's brilliant. Also, she's beautiful!
Furthermore is used to introduce a piece of information or opinion that adds to or supports the previous one.
Furthermore, I will have to know all the data.
You use moreover to introduce a piece of information that adds to or supports the previous statement.
There was a man behind her. Moreover he was observing her strangely.
Thesaurus for secondly from the Collins English Thesaurus
You say secondly when you want to make a second point or give a second reason for something.