The phrase "most tissuelike" implies a texture or quality that is similar to tissue paper or fabric. Antonyms for this phrase could include "rough," "coarse," or "harsh." These words suggest a texture that is unpleasant to the touch and lacks the smoothness or delicacy associated with tissue materials. Other antonyms might include "stiff," "heavy," or "rigid," which could describe textures that are stiff or inflexible rather than being soft and pliable like tissue. Additionally, words like "unnatural," "artificial," or "synthetic" could suggest a texture that is not found in nature, or one that feels synthetic or fake to the touch.