What does adverse mean?
The definition of adverse
Ad”verse, a.
Etym: [OE. advers, OF. avers, advers, fr. L. adversus, p. p. advertere to turn to. See Advert.]

1 Acting against, or in a contrary direction; opposed; contrary; opposite; conflicting; as, adverse winds; an adverse party; a spirit adverse to distinctions of caste.
2 Opposite. “Calpe’s adverse height.” Byron.
3 In hostile opposition to; unfavorable; unpropitious; contrary to one’s wishes; unfortunate; calamitous; afflictive; hurtful; as, adverse fates, adverse circumstances, things adverse. Happy were it for us all if we bore prosperity as well and wisely as we endure an adverse fortune. Southey. Adverse possession (Law), a possession of real property avowedly contrary to some claim of title in another person. Abbott.

Synonyms
— Averse; reluctant; unwilling. See Averse.

Ad*verse”, v. t.
Etym: [L. adversari: cf. OF. averser.]

To oppose; to resist. [Obs.] Gower.