paradoxical
[ par-uh-dok-si-kuh l ]
/ ˌpær əˈdɒk sɪ kəl /
adjective
having the nature of a paradox; self-contradictory.
Medicine/Medical.
not being the normal or usual kind: Stimulants are a paradoxical, albeit effective, medication used for certain forms of hyperactivity.
Sometimes
par·a·dox·al.