c. 1300, laghful, "rightful, supported by law" (of sanctions, etc.); see law (n.) + -ful. Meaning "allowed by law" is late 14c. Similar construction in Old Norse logfullr. Old English had lahlic. Related: Lawfully; lawfulness.
the true and lawful king
lawful methods of dissent
lavender
lavish
law
law-abiding
law-breaker
lawful
law-giver
lawless
lawmaker
lawman
lawn