Here's another example of a paragraph written two ways: the first uses mostly neutral words, and the second replaces those with synonyms that have a negative connotation.
Neutral: The stealthy fox crept through the woods, following the smell to the small cabin. Inside, he could see a slender woman talking with a man. She had an assertive voice, and as she turned to gaze out the window, the fox was quick to hide in the shadows.
Negative: The sneaky fox crept through the woods, following the stench to the tiny shanty. Inside, he could see a skinny woman talking with a man. She had a bossy voice, and as she turned to stare out the window, the fox was quick to hide in the shadows.
You can probably tell that although the meaning of each short story has not changed, the feelings you got when you read them were very different. For this reason, you must be very careful when making word choices in your writing. An affordable or inexpensive choice feels much better than a cheap one. Many people would rather be described as 'slender' instead of 'skinny.' Childish has a negative connotation, but youthful does not.
Be wary of these other words with negative connotations. Depending on the purpose of your writing, you may want to replace them with the more neutral synonyms.