As nouns the difference between insincerity and folly
is that insincerity
is property of being insincere, lacking sincerity or truthfulness while folly
Property of being insincere, lacking sincerity or truthfulness.
- His insincerity was obvious to all; he was neither honest nor believable.
Thoughtless action resulting in tragic consequence.
- This is a war of folly .
A fanciful building built for purely ornamental reasons.
- The purchase of Alaska from Russia was termed Seward's folly.
- A luncheonette in the shape of a coffee cup is particularly conspicuous, as is intended of an architectural duck or folly .