1. causing no offense; harmless or inoffensive
Usage: somewhat rare
2. having no means of attack or aggression
Usage: archaic or literary

Examples

• The children’s book was completely offenseless and suitable for all ages.
• Her offenseless manner made everyone feel comfortable around her.
• The small village remained offenseless against the approaching army.
• He presented himself as offenseless, with no intention to harm anyone.
• The offenseless creature posed no threat to the hikers.