Infelicitous
Part of speech: adjective
Definition: Unhappy or unfortunate. Inappropriate; not well said, expressed, or done; awkward.
Unfortunate
Part of speech: adjective
Definition: not favored by fortunemarked or accompanied by or resulting in misfortune
Part of speech: noun
Definition: an unlucky person
Example sentence: I agree that my single-minded approach was a failing in life, but if I upset people, it was never intentional - it was just the unfortunate result of a burning desire to get the best out of myself and achieve as much as possible.