Synonyms for Seamy:

adj.

seamy (adjective)
bad, disturbing, sordid, disagreeable, disreputable, squalid, disappointing.

n.

deviant, evil, sinful, wicked, unethical, perverted, immoral, gross, amoral. seamy (noun)
disreputable, sordid, squalid, seedy, sleazy.
unpleasant (noun)
bad, disturbing, disappointing, disagreeable.

Other synonyms:

Other relevant words:
bad, disturbing, disappointing, disagreeable.