Given the statements provided, the exception in which there is an incorrect usage of a word is;
The term desultory is similar in meaning to the word, haphazard. Therefore, the statement can be rephrased to mean that Howard's belongings were kept carelessly in his room.
So the word was used correctly.
In the second sentence, believing that the word is 'dangerous', it fits correctly because it will be harmful to Howard not to pay his bills. So, this word also matches the sentence.
In the third sentence, guilty will be a better way to express the way Howard felt when he got a call from the phone company.
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