She only gives a superficial impression of warmth and friendliness?

Analyze the question: The underlined word is superficial. We need its opposite (antonym) from the options.

Explain the concept: Superficial means on the surface only, shallow, lacking depth or real feeling. For example, "a superficial impression" is one that is not thorough or genuine at a deeper level.

Its opposites include: deep, profound, thorough, genuine, in-depth.

Solution (testing each option):

• A. a strong: Strong describes force or intensity, not depth. It is not the direct opposite of "surface-level". Also, "a strong" doesn't fit the grammar well here.
• B. a fake: This is closer to a synonym, since a superficial show of warmth can be insincere. So this is not the opposite.
• C. deep: The opposite of "on the surface" or "shallow" is "deep", so this is the true antonym. Read it in the sentence: "She only gives a deep impression of warmth and friendliness." This makes sense and reverses the meaning.
• D. an unrealistic: This has no direct opposition to superficial.

Answer: The best antonym of superficial is deep, which is option C.

Tip: In antonym questions, think of the root image of the word. Superficial comes from "super" (above) + "facies" (face or surface), so it means "surface only". The opposite is going beneath the surface, which is deep. Also watch out for options like "fake", which are related in meaning and tempt you into choosing a synonym instead of an antonym.