Je was op zoek naar: implausibles (Frans - Engels)

ces hypothèses peuvent varier d'un auteur à l'autre selon sa vision plus ou moins optimiste des possibilités sans devenir pour cela implausibles.
these assumptions can vary from one author to another according to the degree of optimism with which he views the possibilities, without this making them implausible.

many of the youth, on the other hand, did not care about the health messages and believed the health risks were implausible."
some smokers are also superstitious about certain messages ("mom will only buy the packs with 'smoking harms your baby' on them").