Nouns

Precaution- something that is done in advance to prevent problems or to avoid danger.
She didn’t take any precautions, so she got pregnant.
You will have to show that you had taken all precautions.
Impression- an idea or-feeling that you get about something or somebody.
I gave the impression of being very tired.
Rival- a person or company that competes with another in sport, business etc.
This latest phone has no rivals.
Adjectives
Imprudent- not wise or sensible.
It might be imprudent to spend money on this course.
Trivial- not important or serious.
It sounds trivial.
Verbs
Molest- to attack somebody
He has molested his child.
Enclose- to build a wall, fence etc.
The land was enclosed with a newly build fence.