Cobras are always very alert.
alert being quick to notice things going on around you
The alert guard perceived a dim shape in the distance.
Such an alert man as he couldn't have failed to adapt himself to the new situation.
They took turns at staying awake and being alert to keep watch while the others slept.
So you mean they work harder and are more creative because a power-nap – a quick sleep – makes workers feel refreshed and more alert.
When you’re driving, you must stay alert.
a bomb alert The army was put on (full) alert as the peace talks began to fail.
Our competition is alert.
to alert somebody to something
I'm not feeling very alert today - not enough sleep last night!
You have to be very alert if you are driving at night in heavy rain / Someone had better alert the police; we've been robbed.
Suddenly he found himself awake and fully alert. Two alert scientists spotted the mistake.
Remember to stay alert and don’t let anyone in without their ID cards.
Be cautious and don't go too far!
Stay cautious - somebody is watching us.
Becky's become a very cautious driver since her accident.
Tom thinks that Mary is being unnecessarily cautious.
To be cautious is often to show wisdom.
You are game, but more cautious thinking about safety.
I am cautious with regard to this question of turning outward and inward.
As far as Bob is concerned, anything goes. By contrast, Jane is very cautious.
Perhaps a more cautious approach would bring better results.
/ˈkɔː.ʃəs/ He's a cautious driver.a cautious approach cautious criticism
Auto companies are taking a cautious approach toward introducing electric cars.
Someone who is cautious avoids risks: He's a cautious driver.
If I had been cautious I wouldn; t have left the bag on the bench.
Since his arrival in town, all the women have remained cautious about him.
I was bitten by a dog in my childhood, so now I'm a little wary of them.
He seems to be wary of us.
I tried to teach her being wary
And so although he loved her and easger to please her, the little prince soon grew wary of her.
I was wary of showing my intentions.
... will soon become as wary of immigrants as many...
He is first surprised by what he hears, then wary, then suspicious.
I have to tell them to be wary of the police.
Describe yourself as wary if you don't quite trust someone or something and want to proceed with caution. Be wary of risky things like wild mushrooms and Internet deals!
be wary about sth
Keep a wary eye on her house.
Teachers are often wary of standardized tests.
He is very unwary person.
Some people has wary respect for what he might do to you
4. wide awake
Although I hadn't slept for two days, I felt wide awake.
5. in alert