DictionaryRoot: sensatus
Latin
sensatus
gifted with sense
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adjective
insensate
in-SEN-sayt/ˌɪnˈsɛnˌseɪt/
Lacking the capacity to feel what is present.
Etymology
Negating “gifted with sense” gives the image of being without sensation. English extended this lack of physical feeling to a lack of moral feeling, making insensate also mean unfeeling or without compassion.