"Wast flabbergasted" can be described using several other synonyms that convey the same level of surprise and shock. Other words that can be used in place of "wast flabbergasted" include stunned, amazed, astonished, gobsmacked, shocked, and taken aback. All these words express a feeling of being caught off guard and overwhelmed by unexpected events or information. Each of these words is perfect for conveying the level of shock one may feel when facing a situation they never expected. The use of these synonyms depends on the context, tone, and level of formality within which they are being used.