Learner's definition of JEALOUS
[more jealous; most jealous]
feeling or showing jealousy: such as
feeling or showing an unhappy or angry desire to have what someone else has
— often + of
feeling or showing unhappiness or anger because you think that someone you love (such as your husband or wife) likes or is liked by someone else
very concerned about protecting or keeping something
— + of
He spoke jealously of his friend's success.
He jealously accused his wife of flirting with other men.
a jealously [=closely] guarded secret