Using 'fulsome' can imply insincerity or unpleasant excessiveness, often perceived negatively. Her fulsome praise made the audience uncomfortable.
Pro Tip 2/3
Sarcastic Context
In modern use, 'fulsome' often appears in sarcastic comments where the praise is clearly too much. A fulsome smile plastered on his face, he congratulated his rival.
Pro Tip 3/3
Avoiding Overuse
Be cautious when using 'fulsome' to avoid misunderstanding since it can be taken as fake enthusiasm. The new actor received fulsome acclaim, but few took it seriously.