1) Discursive 2) Excursive 3) Irrelevant 4) Rambling 5) Tangential 1) Irrelevant 2) Tangential 3) Tending to digress 4) Tending to ramble 
• (a.) Departing from the main subject; partaking of the nature of digression.
Di·gress'ive adjective [ Confer French digressif .] Departing from the main subject; partaking of the nature of digression. Johnson. 
[adj] - of superficial relevance if any 2. [adj] - (of e.g. speech and writing) tending to depart from the main point or cover a wide range of subjects
discursive adjective (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 excursi...
tending to digress; departing from the main subject.