instinctive

US /ɪnˈstɪŋk.tɪv/
UK /ɪnˈstɪŋk.tɪv/
1.

สัญชาตญาณ

Instinctive behavior or reactions are not thought about, planned, or developed by training:

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an instinctive reaction
:
instinctinstinctively