53:30 This is the extent of their knowledge. Your Lord is fully aware of those who strayed away from His path, and He is fully aware of those who are guided.
The Monotheist Group (The Quran: A Monotheist Translation)
Dictionaries
Ejtaal Arabic Almanac: Lane's Lexicon, Hans Wehr, Lisan al-Arab and others
AND REMEMBER that brother of [the tribe of] Ad,* how - seeing that [other] warnings had already come and gone within his own knowledge as well as in times beyond his ken -* he warned his people [who lived] among those sand-dunes: Worship none but God! Verily, I fear lest suffering befall you on an awesome day!"