Done with hands or wrists that are slack. / Idly or carelessly.

A collection of slack-handed people.

The quality or state of being slack-handed.

With the mouth in an open position and the jaw hanging loosely, especially as indicating bewilderment or astonishment. / (by extension) Unsophisticated or unthinking; dimwitted in appearance.

(informal) To be deliberately unproductive in one's work or study. / To decrease in intensity; to ease off; to diminish; to die down.

(colloquial, UK, chiefly North Country and Yorkshire) A slovenly woman.

Alternative spelling of slack-key

(music) (of a string instrument or a manner of playing one) Performed with loosened strings, such that all of the strings play in the same key (most often G major).

(manufacturing) The inadequate filling of a package so that it contains too little of the product.

plural of slack fill