Timorous in a sentence?

The timorous child has his mother check under his bed for monsters.

You just did. :-) No seriously, "timorous" means nervous or anxious, so you could say, "Joe was feeling very timorous."

The timorous littile boy, was hiding under the bed when he heard someone break into his house.

When it has a subject, verb, punctuation, capitalization, a predicate, and a complete thought. A sentence is a sentence when it is handed down by a judge (or a magistrate).

A sentence is a sentence because it has a subject (noun or noun phrase), a predicate ( verb) and punctuation as well as the other parts of speech like pronouns ( she, it him, her, they, them)...