"Outside" is often an adverbial (modifies a verb) but it is also a noun.
As an adverb: The tree is outside the fence.
As a noun: The outside of the box was smooth.
The humidity outside is high
ucan use the word thermal in a sentence like this: Since it is cold outside i am going to wear thermAL underwear
she walked bare foot outside
you can't! There is a beautiful fjord outside.
You try to make a sentence related to the word. For example: "the warlords seized the the city outside of its gates".
The weather is blazing hot outside today.
i believe there is a chance of flurries outside tonight
When I was outside it was raining and my clothes had become wet
the cat was outside in the rain, crying piteously
Although it is raining, I decided to walk outside anyway.
He looked at me apologetically before following Stacy outside.
"Please put on your shawl, its quite chilly outside!" :))