|Noah Webster's Dictionary|
1. (v. t.) To make stiff; to make less pliant or flexible; as, to stiffen cloth with starch.
2. (v. t.) To inspissate; to make more thick or viscous; as, to stiffen paste.
3. (v. t.) To make torpid; to benumb.
4. (v. i.) To become stiff or stiffer, in any sense of the adjective.
Stiffen (3 Occurrences)
Deuteronomy 10:16 Circumcise then the foreskin of your heart, and stiffen your neck no more. (DBY NAS)
2 Chronicles 30:8 Now be ye not stiffnecked, as your fathers were; but yield yourselves unto the LORD, and enter into His sanctuary, which He hath sanctified for ever, and serve the LORD your God, that His fierce anger may turn away from you. (See NAS)
Jeremiah 17:23 And they have not hearkened nor inclined their ear, And they stiffen their neck not to hear, And not to receive instruction. (YLT NAS RSV)