brashness

(materials) Pertaining to wood that possesses relatively low shock resistance and therefore fails abruptly when broken during bending.

noun

1. Foolhardy boldness or disregard of danger: foolhardiness, incautiousness, rashness, recklessness, temerariousness, temerity. See careful/careless.
2. The state or quality of being impudent or arrogantly self-confident: assumption, audaciousness, audacity, boldness, brazenness, cheek, cheekiness, chutzpah, discourtesy, disrespect, effrontery, face, familiarity, forwardness, gall, impertinence, impudence, impudency, incivility, insolence, nerve, nerviness, overconfidence, pertness, presumptuousness, pushiness, rudeness, sassiness, sauciness. Informal brass, crust, sauce, uppishness, uppityness. See attitude/good attitude/bad attitude/neutral attitude, courtesy/discourtesy.

The noun has 2 meanings:

Meaning #1: tasteless showiness
  Synonyms: flashiness, garishness, gaudiness, loudness, meretriciousness, tawdriness, glitz

Meaning #2: the trait of being rash and hasty