What does air-smoothed mean?
Air-smoothed means (rare) streamlined.
Pronunciation varies by accent · adjective
(rare) streamlined.
The exterior of the train is perfectly air-smoothed and to cut passenger steps up to recessed doors would never do; when the deep doors are shut, therefore, the steps fold up ingeniously on the inside of them to create a level floor in the corridor of the coach.
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Air-smoothed means (rare) streamlined.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The exterior of the train is perfectly air-smoothed and to cut passenger steps up to recessed doors would never do; when the deep doors are shut, therefore, the steps fold up ingeniously on the inside of them to create a level floor in the corridor of the coach.
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