An argument that seems correct only if you do not think about it very carefully is an example of aspecious argument.
- seeming to be good, sound, correct, logical, etc. without really being so; plausible but not genuine: specious logic
- Obs. pleasing to the sight
Origin of speciousME, fair, beautiful from Classical Latin speciosus, showy, beautiful, plausible from species, look, show, appearance: see species
- Having the ring of truth or plausibility but actually fallacious: a specious argument.
- Deceptively appealing: “It is easy enough to give the old idea [of programmatic music] a specious air of modernity” ( Aaron Copland )
Origin of speciousMiddle English attractive from Latin speciōsus from speciēs appearance ; see spek- in Indo-European roots.
- spe′ci·os′i·ty spe′cious·ness
(comparative more specious, superlative most specious)
From Latin speciÅsus (“good-looking").