grinch

noun grinch

• pessimist — a person who habitually sees or anticipates the worst or is disposed to be gloomy.
• complainer — A complainer is someone who complains a lot about their problems or about things they do not like.
• grouch — to be sulky or morose; show discontent; complain, especially in an irritable way.
• whiner — to utter a low, usually nasal, complaining cry or sound, as from uneasiness, discontent, peevishness, etc.: The puppies were whining from hunger.
• dampener — to make damp; moisten: to dampen a sponge.