G4642 σκληρόςσκληρός
sklēros
sklay-ros'
From the base of G4628; dry, that is, hard or tough (figuratively harsh, severe)
KJV Usage: fierce, hard.
G4646 σκολιόςσκολιός
skolios
skol-ee-os'
From the base of G4628; warped, that is, winding; figuratively perverse
KJV Usage: crooked, froward, untoward.
G4647 σκόλοψσκόλοψ
skolops
skol'-ops
Perhaps form the base of G4628 and G3700; withered at the front, that is, a point or prickle (figuratively a bodily annoyance or disability)