specious

IPA: spˈiʃʌs

Seemingly well-reasoned, plausible or true, but actually fallacious.
Employing fallacious but deceptively plausible arguments; deceitful.
Having an attractive appearance intended to generate a favorable response; deceptively attractive.
(obsolete) Beautiful, pleasing to look at.
Alternative form of speciose (“rich in species”). [(taxonomy) Rich in species, such as when many species are members of a single genus.]

Examples of "specious" in Sentences

The salesman's specious claims of the product's effectiveness were quickly debunked by scientific research
His specious argument tried to deflect blame onto someone else, but it was obvious he was at fault
The politician used specious reasoning to try to win over voters, but they saw through his deception
The teacher was not fooled by the student's specious excuse for not completing the assignment on time
The magazine article made specious claims about a miracle weight-loss pill that raised skepticism among readers