sarcastically
adv. B2 Upper Intermediate US //sɑɹˈkæstɪkɫi// UK //sɑːkˈɑːstɪkli// sar·cas·ti·cal·ly
adv. to say something in a way that is not serious and is meant to be funny or to show you do not believe what you are saying.
adv. in a manner that is intentionally ironic or mocking, often to express a lack of sincerity or to convey a negative attitude.
He thanked me sarcastically for my help.
She responded to the bad news with a sarcastically cheerful comment to hide her frustration.
The politician's sarcastically dismissive remarks regarding the economic crisis were intended to undermine his opponent's credibility, though they only served to alienate the very voters he hoped to win over.
From sarcastic + -ally.