crankiest
crank-i-est
adjective
The most irritable, bad-tempered, or easily annoyed of a group.
"The toddler was at his crankiest before lunch."
Thesaurus
Synonyms: techy, tetchy, scratchy, fractious, peckish, peevish, irritable, petulant, testy, cranky, ill-natured, nettlesome