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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.

Keep a watchful eye

Not being watchful, the driver failed to stop in time.

He was watchful for any sign of diabetes.

You can't be too vigilant.

Following the bomb scare at the airport, the staff have been warned to be extra vigilant.

The thief was spotted by vigilant neighbours.

Always remain vigilant when mountain climbing.

He was getting too old to be vigilant all the time.

It is important that you be vigilant and protect your heart from the enemy.

"Do you all remember how beautiful and safe a place Brussels was," he asked. "Not anymore, it is from a different world! US must be vigilant and smart!"

You say you mean to remain vigilant, but I think that is rather insufficient. alert........ cautious........

With government like this you mast remain vigilant.

The police warn that they have been more muggings in the area than usual and they suggest people be vigilant.

"We need to be vigilant

Up here, where the police were vigilant, things were all right.

I'm awake.

There are mothers and fathers who will lie awake after the children fall asleep and wonder how they'll make the mortgage, or pay their doctor's bills, or save enough for their child's college education.

Whether I'm sleeping or awake, I think of you all the time.

Plenty of opportunities will present themselves, if only you are awake to them.

The flight attendant shook Tom awake and told him that the plane had landed.

Tom just got up and still isn't quite awake.

He shook me awake, shouting, "A fire!"

I would keep waiting for you if I had to stay awake past midnight.

We need it when asleep as well as when awake.

It goes without saying that those who are awake to their own rights must respect those of others.

Tokyo, which is the largest city in Japan, is awake 24 hours.

You should awake to your responsibilities.

The brain waves during REM sleep are the same as when awake, and it's the stage when you have dreams.

As soon as the alarm rang, I jumped out of bed, wide awake.

It's quite possible that there are times I am half awake, and thus the day feels shorter.

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.

Be 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.