patient (adj.)

c. 1200, pacience, "quality of being willing to bear adversities, calm endurance of misfortune, suffering, etc.," from Old French pacience "patience; sufferance, permission" (12c.) and directly from Latin patientia "the quality of suffering or enduring; submission," also "indulgence, leniency; humility; submissiveness; submission to lust;" literally "quality of suffering." It is an abstract noun formed from the adjective patientem (nominative patiens) "bearing, supporting; suffering, enduring, permitting; tolerant," but also "firm, unyielding, hard," used of persons as well as of navigable rivers, present participle of pati "to endure, undergo, experience," which is of uncertain origin.

Patience, n. A minor form of despair, disguised as a virtue. [Ambrose Bierce, "Devil's Dictionary," 1911]

Meaning "quiet or calmness in waiting for something to happen" is from late 14c. Meaning "constancy in labor or exertion" is attested from 1510s. Meaning "card game for one person" is from 1816.

also out-patient, 1715, "patient not residing at a hospital, person who is treated at a hospital but not admitted," from out- + patient (n.). The adjective is recorded by 1879.