This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of smooth.

adj. made smooth by ironing

"Her expression smoothed into something akin to relief."

unlined    creaseless    flowing    glassy    sleek    uncreased    even-textured    smooth-textured    streamlined    velvety   

bumpy    uneven    rough   

smoothed    smoothes    smoothing    smoothness    smooths   

free    rid    disembarrass    accomplishment    achievement   

even    calm    uneventful    bland    gloze    handle    flatter    ease    smooth calf    smooth lungwort   

smooth muscle    smooth operator    smooth sailing    smoothly    smoothie    smooth jazz    smooth move    smoothness    smoothen    smoother   

adulatory    glossy    flat    flattering    sleek    soft    voluble    level    soothing    deceptive   

soothe   

soft    broad    bare    clean    slow    surface    rose    fresh    cold    salt