Which of the following is synonymous with 'obscene'?

The term 'obscene' typically refers to something that is offensive, indecent, or morally unacceptable, particularly in relation to sexual content or behavior. When considering the options, the word 'unacceptable' captures this essence effectively, as it implies a level of disapproval or inappropriate nature that aligns with the definition of 'obscene'.

The other options—'discreet,' 'suitable,' and 'delightful'—convey meanings that are quite different from 'obscene.' 'Discreet' relates to being careful or prudent, particularly in speech or action, while 'suitable' suggests appropriateness or fitness for a particular situation. 'Delightful' carries a positive connotation, indicating something that brings pleasure or joy. None of these words resonate with the idea of being offensive or morally questionable, which is central to understanding the term 'obscene.'