unfeeling

A cool head, an unfeeling heart, and a cowardly disposition prompted him, at the age of nineteen, to assume the mask of hypocrisy, which he never afterwards laid aside….

“Be careful about being too dismissive,” Okrepie said, or coming across as unfeeling.

It’s Tim, in the process of discovering his own voice, who soon recognizes in Hawk the unfeeling operator, the self-described “Switzerland,” the “coward,” and so poses the greatest threat to his position.

It’s what makes you a thinking, sentient being rather than an unfeeling mechanism.

The conventional wisdom about insects has been that they are automatons—unthinking, unfeeling creatures whose behavior is entirely hardwired.