From an unused root meaning to push aside; contempt -- despite(-ful).
Englishman's Concordance
1) despite, contempt Part of Speech: noun masculine A Related Word by BDB/Strong’s Number: from an unused root meaning to push aside Same Word by TWOT Number: 2345a
Brown-Driver-Briggs
שְׁאָטnoun [masculine]despite, contempt (expanded from שׁוּט above, Köi. 439; ii. 1. 486); — absolute ׳בִּשׁבְּנֶפֶשׁEzekiel 25:15with despite in the soul; construct ׳בִּשׁנֶפֶשׁEzekiel 36:5; suffix ׳בְּכָלשָֽֿׁאטְךָ בְּנEzekiel 25:6 (Ges§ 23c Köii. 1. 67).
שׁוּל (√ of following; compare Arabic hang down loose).
Ezekiel 25:6 HEB:וַתִּשְׂמַ֤ח בְּכָל־ שָֽׁאטְךָ֙ בְּנֶ֔פֶשׁ אֶל־ NAS: with all the scorn of your soul KJV: in heart with all thy despite against the land INT: and rejoiced all the scorn of your soul against
Ezekiel 25:15 HEB:וַיִּנָּקְמ֤וּ נָקָם֙ בִּשְׁאָ֣ט בְּנֶ֔פֶשׁ לְמַשְׁחִ֖ית NAS: vengeance with scorn of soul KJV: vengeance with a despiteful heart, INT: taken vengeance scorn of soul to destroy
Ezekiel 36:5 HEB:כָּל־ לֵבָב֙ בִּשְׁאָ֣ט נֶ֔פֶשׁ לְמַ֥עַן NAS: joy [and] with scorn of soul, KJV: of all [their] heart, with despiteful minds, INT: all of all heart scorn of soul because of