Strong's Concordance
Original word: λεῖος
Transliteration: leios
Definition (short): smooth
Definition (full): smooth
NAS Exhaustive Concordance
Word Origin: a prim. word
Definition: smooth
NASB Translation: smooth (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
Copyright © 1981, 1998 by The Lockman Foundation.
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Copyright © 1981, 1998 by The Lockman Foundation.
All rights reserved Lockman.org
Strong's Exhaustive Concordance
Apparently a primary word; smooth, i.e. "level" -- smooth.
References
KJV:
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;
NASB:
'EVERY RAVINE WILL BE FILLED, AND EVERY MOUNTAIN AND HILL WILL BE BROUGHT LOW; THE CROOKED WILL BECOME STRAIGHT, AND THE ROUGH ROADS SMOOTH;