Grumpiest

Part of speech: adjective

Definitions

1. Exhibiting the most pronounced signs of irritability, often resulting in a surly attitude or frequent expressions of discontent
2. Reflecting an extreme level of annoyance or displeasure, making someone particularly cranky or moody in disposition
3. Displaying the highest level of crankiness or grouchiness compared to others

Etymology: "Grumpiest" is the superlative of "grumpy," so its history is that of the adjective it modifies. "Grumpy" is formed from "grump," a noun meaning a surly or sulky mood, plus the suffix "-y," which turns a noun into an adjective meaning "characterised by" or "inclined to" that thing. The "-y" ending is ordinary English word-building, found in words like "sleepy" and "bumpy." The "-iest" ending simply marks the superlative, the form used for the highest degree of the quality. The noun "grump" itself is the more interesting piece. It is an English word, traceable to a Germanic stem that also produced the idea of grumbling and muttering, and it describes a person who keeps up a low, complaining murmur rather than shouting outright. That sound-based character is why the word has a grumbling, rumbling feel to it, even though the meaning is simply bad temper.

Synonyms: crankiest, irritablest, crossest, surlier, testiest

Antonyms: cheerful, happy, pleasant, sociable, friendly