似是而非

sìshìérfēi
apparently right but actually wrong; specious (idiom)

CEDICT

Entry Composition

=1 似 sì
  1. to seem
  2. to appear
  3. to resemble
  4. similar
  5. -like
  6. pseudo-
  7. (more) than
=1 似 sì old variant of 似 sì
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì
3 而 ér
  1. and
  2. as well as
  3. and so
  4. but (not)
  5. yet (not)
  6. (indicates causal relation)
  7. (indicates change of state)
  8. (indicates contrast)
4 非 fēi
  1. to not be; not
  2. wrong; incorrect
  3. non-; un-; in-; de-
  4. to reproach; to blame
  5. (coll.) to insist on; simply must