For-heardian

According to the Old English Dictionary:

for-heardian

p. ode; pp. od To harden, become hard; indūrăre :-- He forheardaþ and fordrugaþ indūret et arescat, Ps. Lamb. 89, 6. [Dut. ver-harden to harden: Ger. ver-härten to grow hard, to harden.] for-heardian