Crossword clue: a deliberately invalid argument displaying ingenuity in reasoning in the hope of deceiving someone

The most common answer is sophism (7 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

sophism 7 letters wn-def

a deliberately invalid argument displaying ingenuity in reasoning in the hope of deceiving someone

sophistry 9 letters wn-def

a deliberately invalid argument displaying ingenuity in reasoning in the hope of deceiving someone