Gnomish
uchir
noun. recklessness; carelessness; security
uchirin
adjective. secure
uchirthol
adjective. reckless
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A noun in the Gnomish Lexicon of the 1910s translated “recklessness; carelessness” but also “security” (GL/74), apparently a negated form of G. hîr “care, anxiety; heed” (GL/49). These seemingly opposite meanings appear to be intentional, since it has adjectival forms G. uchirthol “reckless” and G. uchirin “secure” (GL/74). Perhaps its meaning “security” originally came from “[lack of] security”, and uchirin “secure” is somehow double-negated.