A primitive root; properly, to boil up, i.e. (figuratively) to be peevish or angry -- fret, sad, worse liking, be wroth.
Englishman's Concordance
1) to fret, be sad, be wroth, be vexed, be enraged, be out of humour 1a) (Qal) 1a1) to be out of humour 1a2) to be enraged, be angry 2) (Qal) 2a) to appear perplexed, appear troubled 2b) to be sad-looking Part of Speech: verb A Related Word by BDB/Strong’s Number: a primitive root Same Word by TWOT Number: 569
Brown-Driver-Briggs
[זַעַף] verbbe out of humour, vexed; be enraged (Aramaic rage against, זְעַףto storm, זַעֲפָאstorm; compare Samaritan blow, breathe) —
Genesis 40:6 HEB:אֹתָ֔ם וְהִנָּ֖ם זֹעֲפִֽים׃ NAS: them, behold, they were dejected. KJV: and looked upon them, and, behold, they [were] sad. INT: and observed behold were dejected
2 Chronicles 26:19 HEB: וַיִּזְעַף֙ עֻזִּיָּ֔הוּ וּבְיָד֥וֹ NAS: for burning incense, was enraged; and while he was enraged KJV: Then Uzziah was wroth, and [had] a censer INT:was enraged Uzziah his hand
2 Chronicles 26:19 HEB:מִקְטֶ֖רֶת לְהַקְטִ֑יר וּבְזַעְפּ֣וֹ עִם־ הַכֹּהֲנִ֗ים NAS: was enraged; and while he was enraged with the priests, KJV: to burn incense: and while he was wroth with the priests, INT: A censer burning was enraged with the priests
Proverbs 19:3 HEB:וְעַל־ יְ֝הוָ֗ה יִזְעַ֥ף לִבּֽוֹ׃ NAS: And his heart rages against KJV: and his heart fretteth against the LORD. INT: against the LORD rages and his heart
Daniel 1:10 HEB:אֶת־ פְּנֵיכֶ֜ם זֹֽעֲפִ֗ים מִן־ הַיְלָדִים֙ NAS: your faces looking more KJV: your faces worse liking than the children INT: see your faces looking more the youths