Antonyms of adj plaintive

1 sense of plaintive

Sense 1
mournful, plaintive -- (expressing sorrow)

INDIRECT (VIA sorrowful) -> joyful -- (full of or producing joy; "make a joyful noise"; "a joyful occasion")

Similarity of adj plaintive

1 sense of plaintive

Sense 1
mournful, plaintive -- (expressing sorrow)
       => sorrowful (vs. joyful) -- (experiencing or marked by or expressing sorrow especially that associated with irreparable loss; "sorrowful widows"; "a sorrowful tale of death and despair"; "sorrowful news"; "even in laughter the heart is sorrowful"- Proverbs 14:13)