Strong’s Greek
G5138 — trachus
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
τραχύς
trachus — pronounced trakh-oos'
perhaps strengthened from the base of 4486 (as if jagged by rents); uneven, rocky (reefy):--rock, rough. see GREEK for 4486
2 occurrences in the KJV.
Luke 3:5
Every valley shall be filled, and every mountain and hill shall be brought low; and the crooked shall be made straight, and the rough ways shall be made smooth;
Acts 27:29
Then fearing lest we should have fallen upon rocks, they cast four anchors out of the stern, and wished for the day.