From apathy + -etic.

• (America, RP) IPA: /æp.əˈθɛt.ɪk/

apathetic

1. Void of feeling; not susceptible of deep emotion.

   Synonyms: passionless, indifferent

   • 1834, L[etitia] E[lizabeth] L[andon], chapter XIV, in Francesca Carrara. […], volume II, London: Richard Bentley, […], (successor to Henry Colburn), →OCLC ↗, page 167 ↗:

     He then added a few general offers of service, but offered as if he would be glad if they were accepted; and when Guido knelt for his parting benediction, it was given with a warmth and sincerity not often used by the apathetic and haughty minister.

2. Of, or pertaining to apatheism.

• incurious, indifferent, impassive
• See also: Thesaurus:calm

• apatheism
• apatheist

• French: indifférent
• German: apathisch, ungerührt
• Italian: apatico, atono
• Portuguese: apático
• Russian: апати́чный
• Spanish: apático, indiferente, desganado