infelicitous

Unhappy or unfortunate.

My last run this month is an amazing performance of an "A2/3" Pacific, No. 60524, Herringbone (could there possibly be a more infelicitous name for a locomotive than this, let alone for the unhappy horse which first had to bear it?), […].

If leading a "dog's life" be considered a peculiar phase of human misery, the life of a Boys' Dog is still more infelicitous.

Inappropriate or awkward; not well said, expressed, or done.

"Now, you've got just grounds for shooting me," he said gaily, and instantly regretted his infelicitous remark.

Of a sentence or utterance: not semantically and pragmatically coherent.