Imperceptible
slight
Imperious
in a confident way
Infallible
perfect, not capable of making mistakes
Prescience
knowledge
Foreknowledge
knowledge of the events before they happen
Kinswoman
a female relative
Obstinate
stubborn
Malady
illness
Austere
plain, without any decoration
Consent to
to give approval
Despondency
unhappiness
Doty
weak-minded
Garrulous
talkative
Alienist
psychiatrist
Unstrung
feeling very upset
Discomfiture
a feeling of being embarrassed
Precipitately
rapidly onward
Impalpable
not easily comprehended
Treatise
a serious book about a particular subject