"Wert on the up and up" is an idiom used to describe a situation or a person's status as honest, trustworthy, and reliable. Its antonyms can be words that describe a person or a situation as dishonest, deceitful, unreliable, and unethical. Words such as shady, dubious, unscrupulous, deceitful, and fraudulent are some of the antonyms for "wert on the up and up." Using these antonyms can change the meaning of a sentence or a statement, giving it a negative connotation or casting doubt on the truthfulness of what is being said. Therefore, it is important to be aware of the antonyms of common idioms to avoid misunderstandings and to use language effectively.