If a castle wall or a defense is “vulnerable,” it is open to an attack or lacking a defense. It is similar in meaning to "undefended," which means not defended. To further help you, if you are “reckless,” you do not consider the results of your actions; “frightened” means scared.

"Illumination" comes from the root verb "illuminate" which means to light something up. The suffix "-ion" indicates a noun.

A "technophile" is someone who loves technology. Any time you see a word that ends with the suffix "-phile," it means that the word will be describing someone who loves something. For example, a "bibliophile" is a person who loves books.

One definition of a "quarrel" is an argument, so "quarrelsome" means often starting or participating in arguments. That means that "argumentative" is the best answer choice.

A "technophobe" is someone who dislikes, or is afraid of, new technology. Any time you see a word that ends in the suffix "-phobe," you know that the word means someone who is afraid of something. For example, an "arachnophobe" is afraid of spiders.

“Portable” means able to be transported or moved, so “moveable,” which means able to be moved, is the correct answer. The suffix "_-_able" generally means able to have something done to it. As for the other answer choices, “predictable” means able to be predicted or boring; “mysterious” means secretive and difficult to understand; “stubborn” means holding to one's opinion even when given a good reason or evidence to change one's mind; and "ornate" means decorated in a fancy, detailed way.