Strong's G5138 · Greek

τραχύς

trachus · trakh-oos'

perhaps strengthened from the base of 4486 (as if jagged by rents); uneven, rocky (reefy)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 2 τραχύς , -εῖα, -ύ [in LXX: Is 40:4 ( רֶכֶס ), etc. ;] rough : ὁδοί ( Is, l.c. ), Lk 3:5 (LXX) ; τοποί (i.e. rocky), Ac 27:29 .† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain