"Ex-tensible" is a term that describes the ability of an object to be extended or stretched. Its antonyms are words that convey the opposite meaning of being inflexible, rigid or constrained. These include words such as inflexible, constrained, fixed, firm, immovable, stiff, and unyielding. These words describe things that cannot be easily stretched or extended in any way.
In contrast, "ex-tensible" refers to things that can be easily adjusted or modified to suit different purposes. This term is commonly used in computing, software development, and engineering, where objects are designed to be easily manipulated by users. Understanding the antonyms of "ex-tensible" can help us to better understand the concept of flexibility and how it relates to the various tools and systems we use in our daily lives.