Definition of "disarming"

Foremost in her arsenal is that smile – so enormous and so absurdly disarming that someone should have worked out a way to harness its power into international conflict resolution.

2014 January 21, Hermione Hoby, “Julia Roberts interview for August: Osage County – 'I might actually go to hell for this ...': Julia Roberts reveals why her violent, Oscar-nominated performance in August: Osage County made her feel 'like a terrible person' ”, in The Daily Telegraph (Review)‎