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physiological; physical
visceral; instinctive; in one's guts
生理的に無理だと感じた。
I felt it was physically impossible.
その匂いは生理的に受け付けない。
That smell is something my body just won't accept.
生理的な反応として心拍数が上がることは珍しくない。
It's not unusual for heart rate to rise as a physiological response.