eckig
angular
Describing a shape that has corners and edges and is not round or curved.
Wir suchen einen eckigen Tisch, der gut in die Nische passt.
We are looking for an angular table that fits well into the alcove.

angular
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angular
Describing a shape that has corners and edges and is not round or curved.
Wir suchen einen eckigen Tisch, der gut in die Nische passt.
We are looking for an angular table that fits well into the alcove.

The adjective 'eckig' (angular) is derived directly from the noun 'die Ecke' (corner). All meanings, including the figurative ones, relate to the idea of a corner: something is not smooth, not round, or not easygoing.
Stell den Stuhl bitte in die Ecke.
Please put the chair in the corner.
If 'eckig' (angular) refers to an object, it means the geometric shape. If it refers to a person, it describes either awkward movements or a difficult character.
Das Paket ist ziemlich groß und eckig.
The package is quite large and angular.
In connection with movements, 'eckig' (jerky/angular) is often used to describe a lack of elegance or practice. Typical phrases are 'eckige Bewegungen' (jerky movements) or 'eckig tanzen' (to dance stiffly/awkwardly).
Der Roboter bewegte sich sehr eckig durch den Raum.
The robot moved through the room in a very jerky way.
To describe a difficult character, the fixed expression 'eckig und kantig' (rough around the edges; literally: angular and edged) is often used. It describes a person who is unyielding and often rubs people the wrong way.
Er ist ein ehrlicher Typ, aber eben auch ein bisschen eckig und kantig.
He is an honest guy, but also a bit rough around the edges.
round / about
'rund' and 'eckig' are opposites when describing shapes. 'rund' describes something without corners, for example a ball or a circle. 'eckig' describes something with corners and edges, for example a cardboard box or a table. The words therefore help you clearly distinguish the shape of an object: soft and circular with 'rund', angular and with corners with 'eckig'.

Im Flur steht ein eckiger Tisch aus Holz.
There is an angular wooden table in the hallway.
Das Kind malt eine runde Sonne auf das Papier.
The child draws a round sun on the paper.