Antonyms of adj pert

1 sense of pert

Sense 1
impertinent, irreverent, pert, saucy -- (characterized by a lightly pert and exuberant quality; "a certain irreverent gaiety and ease of manner")

INDIRECT (VIA spirited) -> spiritless -- (lacking ardor or vigor or energy; "a spiritless reply to criticism")

Similarity of adj pert

1 sense of pert

Sense 1
impertinent, irreverent, pert, saucy -- (characterized by a lightly pert and exuberant quality; "a certain irreverent gaiety and ease of manner")
       => spirited (vs. spiritless) -- (displaying animation, vigor, or liveliness)