thất thiệt

Etymology
, with the Central-Southern reading of the second character.

Some dictionary definitions seem to suggest that the second is not from, but the homophonous , however, even if that is the case, there would still be obvious contamination from the Sino-Vietnamese morpheme.

This is the only case where a Sino-Vietnamese compound with thiệt became widely adopted by all dialects.

Adjective

 * 1)  inaccurate; untrue