specious vs. spurious

specious

adjective

  1. apparently good or right though lacking real merit; superficially pleasing or plausible.

    specious arguments.

    Antonyms: genuine

  2. pleasing to the eye but deceptive.

    Synonyms: misleading, false
    Antonyms: genuine

  3. Obsolete.,  pleasing to the eye; fair.

spurious

adjective

  1. not genuine, authentic, or true; not from the claimed, pretended, or proper source; counterfeit.

    Synonyms: deceitful, meretricious, phony, feigned, mock, bogus, sham, false
    Antonyms: genuine

  2. Biology.,  (of two or more parts, plants, etc.) having a similar appearance but a different structure.

  3. of illegitimate birth; bastard.