Dyspeptic (adjective)

1. Suffering from dyspepsia or indigestion.
2. Morose, ill-tempered, or irritable as a result of physical discomfort or bad temper.

Origin:

Late 16th century: via latin from greek duspeptikos, from duspepsia "bad digestion", from dus- "bad" + pepein "to digest".

Examples:

1. The dyspeptic man sat at the bar, nursing his drink and complaining about his latest round of indigestion.
2. The once cheerful and friendly man had become dyspeptic and snappish, his sour demeanor a reflection of his troubled stomach.
3. Her dyspeptic mood was evident from the moment she walked in the door, her irritable scowl and sharp tone setting a negative tone for the meeting.
4. The dyspeptic patient was a frequent visitor to the clinic, his chronic indigestion causing him constant discomfort.
5. The dyspeptic old man was known for his grumbling and complaining, his sour disposition the bane of everyone around him.