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Fulsome
Negative Connotation
Using 'fulsome' can imply insincerity or unpleasant excessiveness, often perceived negatively. 
Sarcastic Context
In modern use, 'fulsome' often appears in sarcastic comments where the praise is clearly too much. 
Avoiding Overuse
Be cautious when using 'fulsome' to avoid misunderstanding since it can be taken as fake enthusiasm. 