Synonyms of 'gushing'
If you describe someone as effusive, you mean that they express pleasure, gratitude, or approval in a very enthusiastic way.
He was effusive in his praise of the general.
If you describe expressions of praise, apology, or gratitude as fulsome, you disapprove of them because they are exaggerated and elaborate, so that they sound insincere.
They have been fulsome in their praise.
Thesaurus for gushing from the Collins English Thesaurus