"Tired" and "sleepy" are synonyms. Both words describe a person who needs rest or sleep. The other words do not have related meanings. "Perky" is an antonym to "tired." "Down" can be used, colloquially, to refer to someone who is depressed or sad, but is much more commonly used to describe a direction.

"Silly," "goofy," and "funny" are all very closely related in meaning. "Grumpy" refers to someone who is in a bad mood. "Rude" refers to someone who does not behave appropriately. "Impolite" refers to someone who has poor manners. "Rude" and "impolite" are synonymous.

The word that has the most similar meaning to PARANOID is "suspicious." Someone who is PARANOID is suspicious or afraid that everything is deliberately going against him. For example: "The boy was PARANOID about spiders getting into his bed, so he pulled off all the sheets and blankets every night before going to sleep." If you are "suspicious," you don't trust someone. 

The prefix "ab" at the beginning of "abnormal" means "not." Therefore, "abnormal" means not normal.

"Indignant" means upset; hurting one's dignity. For example: "Sheila was indignant when Sam accused her of lying."

"Understanding" means grasp mentally; understand.

"Miniature" means small.

TENSE means "rigid, or tight." The word with the most similar meaning on this list is "stiff" which also means rigid, inflexible.

"Relaxed" and "calm" both mean at ease.

"Impatient" means not patient.

If you are "arrogant," you have a high opinion of yourself and your abilities.

"Irate" most nearly means furious, or extremely angry. "Perturbed" also implies a disturbed mental state, but the degree of intensity is not severe enough to be a synonym for "irate". "Measured" and "controlled" both imply a state of calmness that does not correspond with "irate." "Energized" means to be full of vitality or excitement, which has no relation to the word "irate."

"Elated" means to make someone very happy. "Thrilled," which means to cause someone to have a sudden feeling of excitement and pleasure, is the best synonym of "elated."

Incorrect Answers:

"Discontent" means not pleased.

"Maladaptive" means inadequate.

"Miserable" means very happy or uncomfortable, and is an antonym of "elated."

"Worried" involves being anxious or troubled about something.

"Stationary" is an adjective that means "not moving," so we need to pick out another adjective that means "not moving." While "fast-moving" also has to do with movement, it means the opposite of "not moving," so it can't be the correct answer. "Motionless," on the other hand, means "not moving," so "motionless" is the correct answer.

“Final” is an adjective that can mean “coming at the end,” “reached as the outcome,” or “allowing no further doubt.” So, we need to pick out an answer choice that means something like “coming at the end” or “allowing no further doubt.” That means that “initial” cannot be the correct answer, because “initial” means “existing or occurring at the beginning,” making it an antonym, not a synonym, of “final.” “Last,” however, is a word that when used as an adjective means “coming after all others in time or order; final,” and because “last” is the answer choice closest in meaning to “final,” “last” is the correct answer.

“Prepared,” when used as an adjective, can mean “ready for something : in a suitable condition for some purpose or activity,” so we need to pick out an answer choice that means something like “in a suitable condition for some purpose or activity.” That means that “unready” cannot be the correct answer, because “unready” means “not prepared for a situation or activity,” making it an antonym, not a synonym, of “prepared.” “Ready,” however, is an adjective that means “in a suitable state for an activity, action, or situation; fully prepared,” and because “ready” is the answer choice closest in meaning to “prepared,” “ready” is the correct answer.

"Daily" means occurring everyday. Shallow means not deep. Dirty means not clean. Selfish describes someone who cares only about himself. Skinny describes someone who is thin.