His new invention performed phenomenally at the tech expo, impressing all the judges.

phenomenally 是形容词 phenomenal 的副词形式，由名词 phenomenon（现象）加上形容词后缀 -al 构成形容词，再加上副词后缀 -ly 构成副词。phenomenal 意思是"非凡的、惊人的"，phenomenally 表示"非凡地、惊人地"。