Here are a few rhymes for lonely that could have negative or sad connotations:
And some near-rhymes:
Pagod means weary.
The word you are looking for is "guava".
Tame may be the word you're looking for.
exhausted
Tire
The word you're looking for is 'choir' - pronounced 'kwire'
The word you're looking for is 'fleece'.
The word you are looking for is "mass."
The word that means and rhymes with cloak is "joke."
weary
The word "afraid" slant rhymes with the word "away" but means scared.
The word that means kneel and rhymes with melt is "knelt."