BDB6254 [H6075]

II. [עָפַל] verb perhaps be heedless (Arabic be heedless, neglectful, inadvertent); —

Hiph`il shew heedlessness, Imperfect 3 masculine plural וַיַּעְפִּלוּ לַעֲלוֺת Num 14:44 (JE) they shewed heedlessness in going up (went up heedlessly), so de Dieu, cited (and allowed) by Di Buhl^Lex; > Thes and others shewed presumption (I. עפל, this sense dubious).

The Brown-Driver-Briggs Hebrew and English Lexicon
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Source: provided by Tim Morton, the developer of Bible Analyzer