taboo adjective
Synonyms forbidden, outlawed, illegal, unlawful, restricted, off-limits
Antonyms acceptable, satisfactory
Based on the thesaurus entry, which word would best replace the underlined
word without changing the overall meaning of this sentence?
When Ms. Myers reviewed the classroom rules, she reminded us that
chewing gum during her lecture was taboo behavior and completely
unacceptable.

A. Average
B. Childish
C. Satisfaction
D. Forbidden