listen to the pronunciation of invidious
Englisch - Englisch
Hateful; odious; detestable
Enviable; desirable
Prompted by or expressing or adapted to excite envious dislike or ill will; offensively or unfairly discriminating

The professor made invidious distinctions based only on his own whim.

Envious; causing or arising from envy
showing or feeling envy
{s} offensive, discriminatory; causing resentment, hateful
If you describe a task or job as invidious, you mean that it is unpleasant because it is likely to make you unpopular. The local authority could find itself in the invidious position of having to refuse
Likely to incur or produce ill will, or to provoke envy; hateful; as, invidious distinctions
An invidious comparison or choice between two things is an unfair one because the two things are very different or are equally good or bad. Police officers fear invidious comparisons. unpleasant, especially because it is likely to offend people or make you unpopular (invidiosus, from invidia )
containing or implying a slight or showing prejudice; "discriminatory attitudes and practices"; "invidious comparisons"
Envious; malignant
Worthy of envy; desirable; enviable
Malevolent provocation of dislike or resentment; the state or quality of being invidious

Sometimes she caught him looking at her with a louring invidiousness that she could hardly bear.

{a} envious, ill-natured, malicious
In an invidious manner
in a manner arousing resentment
offensively, in a discriminatory manner; in a manner which causes resentment, hatefully
{i} offensiveness, discrimination; hatefulness