Definition of offenceless in US English:

offenceless

adjective

rare, poetic
  • That does not offend, unoffending, inoffensive; not causing offence or disgust. Formerly also: incapable of offence or attack (now rare).

Origin

Late 16th century; earliest use found in Thomas Howell (fl. 1560–1581), poet. From offence + -less.

Pronunciation

offenceless

/əˈfɛnsləs/