Straight stuff refers to being honest and truthful. The antonyms for straight stuff can be considered as those terms which refer to dishonesty and insincerity. Some of the antonyms for straight stuff include deceit, falsehood, dishonesty, fabrication, pretense, trickery and fraudulence. These terms imply a lack of integrity and truthfulness. Being dishonest and insincere can lead to negative consequences for both individuals and organizations. Therefore, it is important to strive for straight stuff in all situations and avoid the use of antonyms that can damage personal and professional relationships. In summary, honesty is the best policy, and the antonyms for straight stuff should be avoided.