A. Serious
B. Playful
C. Fanciful
D. Capricious
Answer: Serious
A. Serious
B. Playful
C. Fanciful
D. Capricious
Answer: Serious
Additional Information: 'Serious' is the antonym of 'whimsical', meaning thoughtful and earnest.
Subjects: Synonyms and Antonyms, Vocabulary