TANGENTIAL

peripheral

only slightly connected

digressing

of superficial relevance if any
SYN - digressive
"a tangential remark"

of or relating to or acting along or in the direction of a tangent
ANT - relevant
"tangential forces"

"He knew that these sort of issues were merely tangential to the office of the presidency and it killed him to see the country vote based on them."

"She really had only a tangential influence on his life."

"The place were he lived was only of tangential interest to finding out about who he was."