অর্থ : In a way that was not expected.
উদাহরণ :
Her brother showed up at the wedding out of the blue.
সমার্থক : out of the blue
অর্থ : Without advance planning.
উদাহরণ :
They met accidentally.
সমার্থক : accidentally, by chance, circumstantially
With intention. In an intentional manner.
He used that word intentionally.Unexpectedly meaning in Bengali (Bangla).