honorable (adj.)

mid-14c. (mid-13c. as a surname, Walter le Onorable, also known as Walter Honurable), "worthy of respect or reverence, respectable," also "signifying or rendering distinction or respect; ensuring good repute or honor," from Old French onorable, honorable "respectable, respectful, civil, courteous," from Latin honorabilis "that procures honor, estimable, honorable," from honorare "to honor," from honor (see honor (n.)). Meaning "honest, sincere, in good faith" is from 1540s; sense of "acting justly" is from c. 1600.

"Now, George, you must divide the cake honorably with your brother Charlie."—George: "What is 'honorably,' mother?" "It means that you must give him the largest piece."—George: "Then, mother, I should rather Charlie would cut it." ["Smart Sayings of Bright Children," collected by Howard Paul, 1886]

As an epithet before the name of a peer, Church or civil official, guild officer, etc., from c.1400. As a noun, "honorable person," late 14c. Alternative adjective honorous (Old French honoros) seems not to have survived Middle English. Related: Honorably; honorableness.

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Definitions of honorable from WordNet

honorable (adj.)
not disposed to cheat or defraud; not deceptive or fraudulent;
Synonyms: honest
honorable (adj.)
worthy of being honored; entitled to honor and respect;
an honorable man
led an honorable life
honorable service to his country
Synonyms: honourable
honorable (adj.)
adhering to ethical and moral principles;
followed the only honorable course of action
Synonyms: ethical / honourable
honorable (adj.)
deserving of esteem and respect;
Synonyms: estimable / good / respectable
From wordnet.princeton.edu