To be "vigilant" is to be watchful and alert for any possible danger. "Mystical" describes a sense of spiritual awe and fascination. "Energetic" and "strong" are synonyms to vigorous, not vigilant.

To be "resigned" to a situation (often an unpleasant one) is to accept it. "Graceful" and "inelegant" are antonyms. "Sinful" means immoral, and "sage" means wise.

"Apprehensive" and "worried" are synonyms referring to the state of unpleasantly anticipating or fearful. "Abrupt" means sudden, unexpected. "Glamorous" means beautiful and bewitching. "Terrified" is too strong a word for "apprehensive," which at most describes a moderate amount of fear and worry.

"Jealous" and "envious" are synonyms; they both refer to the feeling of being upset by the success of someone else. "Critical" means important or serious, and "wary" means cautious or careful. "Clean" and "dirty" are antonyms, as are "agitated" and "calm."

"Tender" can mean gentle, loving, or affectionate, depending on the context. "Infectious" and "contagious" are synonyms, as are "rare" and "uncommon." "Boreal" is a word meaning Northern. While something tender could be sentimental, "sappy" means excessively sentimental and is therefore not the best fit.

"Pleased" and "gratified" both mean to be pleasantly satisfied with something. They are synonymous. The other words are not synonyms of "pleased." "Polite" and "courteous" both refer to having good etiquette; "rude" is an antonym to "polite."

The words "dark" and "brooding" can describe someone who displays solemn or sad emotions. The other words do not share this meaning. "Finicky," for example, refers to someone who is fussy or moody. "Glorious" and "brilliant" are synonymous with each other, but are not at all related to the words dark and brooding. Brilliant can actually mean shiny or illuminated, the opposite of dark.

The correct answer is "jealous."

"Envious" is defined as feeling or showing envy.

"Jealous" is an adjective that means feeling or showing envy of someone, making it the correct synonym of "envious."

The adjective "deranged" means insane, completely mad, mentally ill. Additionally, "spirited" means lively, full of energy; "immature" means not mature, childish, juvenile; "rowdy" means loud and out of control, boisterous; "reckless" means not careful and prone to taking many risks.

The adjective "unrepentant" means remorseless, not feeling any sorrow or regret for harm caused. Additionally, "superficial" means shallow, not containing any depth of emotion or meaning; "deluded" means tricked into believing something misguided or mislead and ignorant; "sublime" means delightful, perfect, lovely, wonderful; "honorable" means moral, righteous, deserving of honor and respect.