robust

robustness

that which is constructed to connect two points for the purpose of transportation: a bridge / a bridge-like walkway or corridor between two buildings in a manor, palace, castle, or similar structure

to know, be aware of / to learn, acquire, / to be acquainted with, to know (someone) / (colloquial, in the negative) to care in the least about, to be concerned with,

stem or continuative form of 知る (shiru) [godan]

Alternative spelling of 物知り: a person with broad knowledge, a knowledgeable person

bridge

ignorance is bliss

complete denial of knowing (an incident in question)

to know through one's own experience