from G573; singleness, i.e. (subjectively) sincerity (without dissimulation or self-seeking), or (objectively) generosity (copious bestowal):--bountifulness, liberal(-ity), simplicity, singleness.
singleness, simplicity, sincerity, mental honesty
the virtue of one who is free from pretence and hypocrisy
not self seeking, openness of heart manifesting itself by generousity