flabbergasted definition : extremely surprised or shocked by something unexpected. Check meanings , examples, usage tips, pronunciation, domains, related words. " Flabbergasted " denotes a state of extreme surprise or astonishment, leaving individuals momentarily speechless or unable to comprehend what has occurred. It often arises in response to unexpected news, events, or actions, causing individuals to experience overwhelming shock or disbelief. Manifesting through wide-eyed expressions or stunned silence, being flabbergasted highlights the unpredictability and wonder inherent in human experiences. The adjective ' flabbergasted ' has a somewhat unclear etymology, but it is believed to be a humorous and whimsical word that was created in the English language. It likely combines elements of various English words, possibly blending 'flabby,' meaning soft or loose, with 'aghast,' meaning filled with shock or horror. Flabbergasted definition: overcome with astonishment; amazed; astounded . See examples of FLABBERGASTED used in a sentence.