A feeling of fear or agitation about something that may happen.
decent
Will one may have trepidation in using this exact word in this sentence. One would use the word trepidation when setting a scene in a story, where a character is worried about entering dark woods at night for example.
Fear.
It means courageous, brave, or fearless. Other synonyms are daring and dauntless. It is from the same word root as "trepidation" (fear, worry), where the prefix in- means "not."
I felt another earthquake beginning, and I was overcome with trepidation. Trepidation caused me to allow all the skiers behind me to go down the formidable slope first.
I assume you know what the word means.
it's a noun, it doesn't have a past tense.
I don't believe there is a 3 letter word for fear in English. The closest would be 'awe' and that is not exactly the same meaning.
Assumption
his propinquity to danger filled him with trepidation
The word is actually trepidation. Intrepidation is a mispronunciation of trepidation.Trepidation means a sense of fear, agitation, alarm, excitement (worry) over something that may happen.
The word that means across the continent is, transcontinental.