expression, i-adjective
unimpressive; mediocre; lackluster
Describes something that fails to stand out or meet expectations; often used for performance, appearance, or results. The phrase is a set negative expression of パッとする (to be striking/successful).
彼のプレゼンはパッとしなかった。
His presentation was unimpressive.
今日の売り上げはパッとしないね。
Today's sales are pretty mediocre, huh.