only too glad, ready, etc.

only too (something)

Very. Don't tell her the truth—she'd be only too glad to use it against you later. As a small business owner, I know only too well how tough it is to succeed in this economy.

only too ˈglad, ˈready, etc. (to do something)

very glad, ready, etc: If you want any advice, I’d be only too willing to give it. ♢ She was only too pleased to help.