Like suboptimal kite-flying weather (4)

I believe the answer is:

calm

(Other definitions for calm that I've seen before include "Absence of wind" , "Imperturbable, soothe" , "Controlled, not agitated" , "Peaceful, undisturbed" , "Tranquil, undisturbed" .)

I've seen this clue in The New York Times.

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