culturally accepted adjectival antonym of 'non sequitur' [closed]

I'd go with the archaic adjective sequent, defined here as "following in a sequence or as a logical conclusion."

You can't get any closer in etymology or connotation.

Well, since we're looking for an adjective, the obvious choices would be:

consequent

relevant

coherent

cogent

All found in the Greatest Online Dictionary Ever

A non sequitur is an inference or a conclusion not logically following from the premisses; a response, remark, etc., that does not logically follow from what has gone before (OED).

It is a noun.

An idiomatic antonym would be a 'logical conclusion'.

So, based on the example above "His non-sequitur response really confused me." -

"His logical response really helped me understand."