The most appropriate antonym for the word spiritual is secular.
- Spiritual means relating to or affecting the human spirit or soul as opposed to material or physical things.
- Secular means not religious or sacred; concerned with worldly matters rather than religious ones.
The other words do not have the same meaning as spiritual and are therefore not antonyms.
- Insubstantial means not having much substance or reality; lacking solidity or tangibility.
- Ethereal means delicate, light, and airy; having an otherworldly quality.
- Immaterial means not having physical or tangible existence; not important or significant.
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