Grouchiest

Part of speech: adjective

Definitions

1. exhibiting a consistently irritable demeanor while showing a heightened level of grumpiness and an unwillingness to engage positively with others
2. marked by an especially cantankerous attitude that reveals a strong tendency to be irritable and dissatisfied with one's surroundings
3. Showing the highest degree of irritability and a quickness to complain or be in a bad mood

Etymology: "Grouchiest" is simply the superlative of "grouchy" with the ending "-est" added, the same pattern that produces "biggest" or "happiest." The superlative ending traces back a long way, to Old English "-est," which in turn came from a Germanic form and, further back, a reconstructed Indo-European superlative suffix. The base word, "grouchy," is the more interesting part of the story: it is a relatively modern formation built on "grouch," a noun for a sulky, complaining mood, and that noun is the piece that gives the adjective its sense of ongoing irritability. Once "grouchy" existed, English speakers formed its superlative in the regular way, so "grouchiest" describes someone who is more sulky and complaining than anyone else in the group.

Synonyms: grumpiest, crankiest, irritablest

Antonyms: cheeriest, happiest