massissa

In a sentence

• La taula és massissa i feta de roure.

  The table is solid and made of oak.

  Here 'massissa' describes an object being made entirely of a single material, emphasizing its sturdiness and uniformity.

• Vaig trobar una peça de marbre massissa al mercat.

  I found a solid marble piece at the market.

  In this sentence, 'massissa' indicates that the piece is undivided and dense, defining its quality.

• Les seves raons són massisses i difícils de discutir.

  Their reasons are solid and hard to dispute.

  This usage of 'massissa' metaphorically extends its meaning of strength and reliability to more abstract concepts, like arguments.