D defs.my
Entry 1 sense Webster, 1913

Imperturbable

· Im·per·turb·a·ble · IPA /ˌɪmpəɹˈtɜɹbəb(ə)l/
01 a. Incapable of being disturbed or disconcerted; as, imperturbable gravity.
  1. 1.
    Incapable of being disturbed or disconcerted; as, imperturbable gravity.