(adj) When a person, group, or other
collective makes a decision(s) or commit action(s) that present problems for them and/or others which would tend to make an unbiased
third party observer believe the perpetrator(s) is(are)
mentally unstable.
"Joann's tendency to throw up after she eats is very problemental."
"Stevo has been so problemental lately; his
irrational behaviors are quite
disconcerting."
"The NRA's defense of guns
after the Sandy Hawk Massacre is very problemental."