"digressive" in the adjective sense
1. digressive, tangential
of superficial relevance if any
"a digressive allusion to the day of the week"
"a tangential remark"
2. digressive, discursive, excursive, rambling
of e.g. speech and writing) tending to depart from the main point or cover a wide range of subjects
"amusingly digressive with satirical thrusts at women's fashions among other things"
"a rambling discursive book"
"his excursive remarks"
"a rambling speech about this and that"
Source: WordNet® (An amazing lexical database of English)
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