Which of the following is INCORRECTLY spelled.

Humerous 

The incorrectly spelled word is Humerous. The correct spelling is Humorous.

The other words are spelled correctly.

• Shrewd means having or showing sharp intelligence and good judgment.
• Amusing means causing laughter or amusement.
• Expressive means showing or revealing one's thoughts or feelings in an evident or readily observable way, especially through facial expressions or body language.