The Greek noun haplotēs has a rich semantic range: it can mean simplicity, sincerity, or liberality/generosity. The root haplos means 'single' or 'unfolded' — the opposite of duplicity. In context it often describes the open-handed, undivided generosity of the heart that gives without ulterior motive.
Haplotēs is the word of undivided giving. In 2 Corinthians 9:11, Paul declares that God will enrich believers for 'great generosity (haplotēs)' — giving that is uncomplicated by self-interest. The word shimmers between two dimensions: the simplicity of a heart without guile and the liberality of hands without a hidden fist. Romans 12:8 calls those with the gift of giving to give with haplotēs — no calculation, no strings, no display. This virtue is the fruit of seeing God's own haplotēs: he 'gives generously to all without finding fault' (James 1:5, using the adverb haplōs).