Someone that plans harm or misfortune for others may also inadvertently be the recipient of that same misfortune.

One cannot always overcome a powerful adversary.

One should treat others as one would like others to treat oneself; an expression of the golden rule.

(manner) Differently, in another way. / (conjunctive) In different circumstances; or else. / (conjunctive) In all other respects.

Other than supposed; different.

Of, concerned with, or preoccupied with a different world than that of the tangible here and now, such as a heavenly, spiritual, or imaginary world.

(obsolete) In another manner.

(paganism) The other realms of existence beyond the world of mankind, especially the realms of the dead or the fairy folk.

(now dialectal or poetic) Some others.

(now dialectal or poetic) Some other; various.