The antonyms for the phrase "more straight up" can be varied depending on the context in which it is used. If we talk about a person's honesty, antonyms might include dishonest, corrupt, or deceptive. Regarding how something is done, antonyms could be convoluted, indirect, or circuitous. When it comes to emotions, antonyms might include guarded, evasive, or uncommunicative. Overall, the antonyms for "more straight up" represent concepts that run contrary to straightforwardness, such as deceitful, complex, or indirect behaviors or attitudes.