The spelling of the word "callens" can be confusing due to its tricky pronunciation. Its correct spelling is actually "callence" which is pronounced /ˈkæləns/. The "e" at the end of the word is often silent, and the emphasis should be placed on the first syllable. This word refers to a state or quality of being callous or insensitive. It's important to remember the correct spelling when using this word in written communication to ensure clarity and professionalism.