This Echinoderm Is a Fragile Stellar Body, __ Star

Puzzle 7 of Architectural Styles Hard Pack

Question is: This Echinoderm Is a Fragile Stellar Body, __ Star

and the answer is: BRITTLE

Word Meaning:

BRITTLE — Inflexible; liable to break, snap, or shatter easily under stress, pressure, or impact.

Definitions from Wiktionary.