What is foreboding? and when we use it?

[Thameem]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #240 "Interactive worksheets (1)", question 4

The dark, eerie and ......... sky seemed to speak to general McKenney about the upcoming violence they were about to face.

(a) forbidding
(b) foreboding
(c) formidable
(d) forfeit

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #240 "Interactive worksheets (1)", answer 4

The dark, eerie and foreboding sky seemed to speak to general McKenney about the upcoming violence they were about to face.

Correct answer: (b) foreboding

Your answer was: incorrect
The dark, eerie and formidable sky seemed to speak to general McKenney about the upcoming violence they were about to face.
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what is foreboding? and when we use it?

[Mister Micawber]

FOREBODING
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Native English teacher at Mister Micawber's