ill-natured -
having an irritable and unpleasant disposition
good-natured having an easygoing and cheerful disposition; "too good-natured to resent a little criticism"; "the good-natured policeman on our block"; "the sounds of good-natured play"
unpleasant disagreeable to the senses, to the mind, or feelings ; "an unpleasant personality"; "unpleasant repercussions"; "unpleasant odors"
nature the complex of emotional and intellectual attributes that determine a person's characteristic actions and reactions; "it is his nature to help others"
waspish,
bristly,
prickly,
splenetic very irritable; "bristly exchanges between the White House and the press"; "he became prickly and spiteful"; "witty and waspish about his colleagues"
crotchety,
ornery,
cantankerous having a difficult and contrary disposition; "a cantankerous and venomous-tongued old lady"- Dorothy Sayers
hot-tempered,
quick-tempered,
short-tempered,
hotheaded,
irascible,
choleric characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)
churlish having a bad disposition; surly; "churlish as a bear"- Shakespeare
