Definition for Surreptitious:

• Done by stealth or without authority; made or introduced fraudulently.

Synonyms for Surreptitious:

• adj.

  •cloak-and-dagger (adjective)
  • hugger mugger.

• n.

  •
  • secretive,
  • confidential,
  • mysterious.
  •clandestine (noun)
  • private.
  •surreptitious (noun)
  • concealed.

Antonyms for Surreptitious:

• adj.

  • sneaky, secret
    forthright, honest, public, open, truthful, aboveboard, authorized.
  • Other antonyms:
    clear, plain, evident, undisguised, straightforward, unrestricted, aboveboard, patent, manifest, avowed, acknowledged, unclassified, obvious.