Suffixes - LESS and -FREE - what's the difference?

careless
without care or attention
Many road accidents are caused by careless drivers. People should pay more attention when driving.
contactless
not touching
It's so much quicker and easier now that we can use our phones to make contactless payments.
harmless
not likely to cause harm
There is only one poisonous snake in the UK. The others are harmless.
homeless
without anywhere to live
The flood destroyed their house. They were homeless for several months and had to stay with friends.
jobless
unemployed
Many of the jobless today are young people leaving university. They just can't find jobs as so many people are applying for the same position.
powerless
unable to do anything to change a situation
When the huge wave hit the boat, he was powerless. He could only stand and watch as the boat sunk.
smokeless
not producing any smoke
In some parts of the city, only smokeless coal can be used in fires, which is cleaner for the environment.
sugarless
not containing any sugar
I'm on a diet, so I'm only having sugarless drinks.
car-free
cars are not allowed
Now that the city centre is car free, it's so much more pleasant to walk in the centre of the city without worrying about cars and buses
carefree
without worries or anxiety
I wish I was on my gap year again - I miss those carefree days, not having to worry about paying the mortgage or getting to work on time.
smoke-free
in which no one is smoking or smoking is not allowed
"I'm sorry, sir, you'll have to put out that cigarette - this is a smoke-free area."
stress-free
without any stress or worry
The journey was completely stress-free. The taxi picked us up at the door and took us straight there. There wasn't any traffic and we arrived early.
sugarfree
not containing any sugar
This drink doesn't have any calories as it's sugarfree.