God save and protect our most beneficent ruler.
munificent
formal
She was one of the museum's more munificent patrons.
Antonym and example
ungenerous
You only gave £2 to the charity? How ungenerous of you.
Go to the thesaurus article about these synonyms and antonyms of lavish with/in.
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If someone is generous, they freely give money, help, etc. to others.