The phrase "are the service of" refers to someone or something being available to provide assistance or aid. Antonyms for this phrase could include "not available," "unavailable," or "absent." When someone or something is not at the service of others, they cannot be relied upon for help or support. Alternatively, antonyms could include "unwilling," "uncooperative," or "stubborn." These words suggest that the person or thing in question is actively refusing to provide service or help, rather than simply being unavailable. Overall, understanding antonyms for common phrases can help to expand one's vocabulary and express ideas with greater precision.