Long hard looks can be described in several other ways. One such synonym is 'stern gaze,' which has a serious and critical connotation. 'Piercing stare' is another synonym, which denotes a sharp and intense look, usually used to express anger or frustration. 'Intense scrutiny' refers to an extremely thorough examination or observation, often used in formal settings. 'Fixed stare' is a synonym for a stare that is unwavering and unyielding, usually intense and focused. Lastly, 'Penetrating gaze' refers to a look that seems to see through you, often used to describe a powerful and confident person.