Antonyms of adj vivacious

1 sense of vivacious

Sense 1
vibrant, vivacious -- (vigorous and animated; "a vibrant group that challenged the system"; "a charming and vivacious hostess"; "a vivacious folk dance")

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

Similarity of adj vivacious

1 sense of vivacious

Sense 1
vibrant, vivacious -- (vigorous and animated; "a vibrant group that challenged the system"; "a charming and vivacious hostess"; "a vivacious folk dance")
       => spirited (vs. spiritless) -- (displaying animation, vigor, or liveliness)