Synonyms of the word 
EPISTOLARY → INFORMAL
epistolary
- n. a Christian liturgical book containing set readings for church services from the New Testament Epistles.
- adj. of or relating to letters, or the writing of letters.
- adj. carried on by written correspondence.
- adj. in the manner of written correspondence.
informal
- adj. Not formal or ceremonious.
- adj. Not in accord with the usual regulations.
- adj. Suited for everyday use.
- adj. (of language) Reflecting everyday, non-ceremonious usage.
- adj. (horticulture) Not organized; not structured or planned.
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