Antonyms

Tender means soft or delicate. The antonym is flinty, which implies hardness or lack of emotion.

Timid means showing a lack of courage or confidence. Valiant is the opposite, meaning possessing or showing courage or determination.

Tame means domesticated or submissive. Feral means existing in a wild or untamed state.

Tough means difficult or hard to break. Easy is the direct opposite, meaning requiring little effort.

A traitor is someone who betrays their country or cause. A loyalist is someone who remains faithful to their cause or country.

 Petty is similar in meaning and is therefore ruled out. Scanty means few. Development refers to the process of developing or maturing from one form to another. This makes critical, which means important the correct answer as this is the most opposite in meaning to trivial.

Vague means unclear or indefinite. Clear is the opposite, meaning easy to perceive or understand.

Unique means being the only one of its kind. Common means occurring or appearing frequently, which is the opposite.

Trifle means something of little value or importance. Crucial means of great importance or significance.

Thin describes someone with little body fat. Flabby describes someone who is soft or loose, often implying excess weight or lack of muscle tone, making it a suitable antonym in this context.

Vain can mean producing no result (futile). Successful is the opposite, meaning achieving a desired aim or result.

A virgin is considered to be chaste and therefore unchaste is the most opposite in meaning. 

Vile means morally base or unpleasant. Laudable means deserving praise, which is a positive antonym, but sterling is a stronger antonym meaning of high quality or excellent.

Wicked means evil or morally wrong. Angelic is the direct opposite, describing someone who is innocent or virtuous.

Virtue refers to moral excellence or goodness. Vice is the direct opposite, referring to immoral or wicked behavior.

Withstand means to remain undamaged or resist. Yield means to give way or surrender, making it the correct antonym.

Win means to be successful or victorious. Lose is the direct opposite.

Young refers to someone in the early stage of life. Elderly refers to someone in the late stage of life, making it the correct antonym.

Yield can mean to surrender or give way, or to produce. As a verb meaning 'to give in', the antonym would be to withhold or refuse. Deny works in some contexts (to refuse to give).

Zenith refers to the highest point. Nadir refers to the lowest point.

Provide means to supply or give something. Snatch means to grab or take quickly and often forcefully. However, withhold or deprive would be more direct antonyms.

Zigzag describes a path with sharp turns. Unswerving means moving in a straight line without turning.

Zip can mean to move rapidly or speed (also 'zipper' or 'nothing'). Stumble means to trip or walk unsteadily - the opposite of smooth, fast movement. This is a movement antonym.

Zest means great enthusiasm or flavor. Blandness means a lack of flavor or excitement.

Wise means having experience or knowledge. Foolish is the direct opposite, meaning lacking good sense.