Synonym of bad-tempered: easily or characteristically angered. / Synonym of malevolent: wishing bad upon others.

unsuitable, unfit or inappropriate for some purpose / not suiting each other; poorly matched

bad, unkind or abusive treatment

bad temper / irritability or surliness

Not well prepared. Not ready, or not in condition to do a task.

To treat someone or something badly or unkindly; to abuse or mistreat.

bad, cruel or unkind treatment

plural of ill humor

(idiomatic) To become ill.

(intransitive, idiomatic) To become ill, to fall ill.