Tolkien's "Special" Words

[Starbrow]

Reck The Fall of Gondolin “Then Morgoth thought in his heart that his triumph was fulfilled, recking little of the sons of Feanor, and of their oath, which had harmed him never and turned always to his mightiest aid.” Meaning: Archaic. To take heed of or to have caution.

 

[Deimos]

Reck The Fall of Gondolin “Then Morgoth thought in his heart that his triumph was fulfilled, recking little of the sons of Feanor, and of their oath, which had harmed him never and turned always to his mightiest aid.” Meaning: Archaic. To take heed of or to have caution.

Reck is in common everyday use today in its negative form:
reckless ... Acting with a heedless disregard for probable outcomes; syn. Rash, foolhardy, thoughtless, careless, (that is, lacking caution )