The word "delinieation" refers to the act of outlining or describing something, either through words or visual representation. Some antonyms to this could include erasure, obscuration, or confusion. Erasure refers to the act of removing or eliminating a previously outlined or described object or idea. Obscuration refers to the act of hiding or rendering unclear the outlines or descriptions of something through various means, such as hiding behind cloud or mist. Confusion refers to the inability to clearly outline or describe an object or idea due to an unclear or muddled state.