Question

The shape of the new sofa for their house was highly _____ and strange.
1. particular
2. testicular
3. irregular
4. jugular

Answer 1

The correct option is 3) Irregular.

Therefore the correct sentence will be The shape of the sofa for their new house was highly irregular and strange.

 Option three is right as shape is always associated with irregular.

Irregular by definition means without symmetry or without even shape or not of formal arrangement.

Answer 2

Irregular 
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The shape of the new sofa for their house was highly irregular and strange 
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Irregular means the material or the thing which has no shape. 

In this sentence the word after the irregular is strange that's why