1) An irreverent mental attitude 2) Attitude 3) French word used in English 4) Lack of reverence or respect 5) Mental attitude 6) Spirit of iconoclasm Found on https://www.crosswordclues.com/clue/irreverence
Ir·rev'er·ence noun [ Latin irreverentia : confer French irrévérence .] The state or quality of being irreverent; want of proper reverence; disregard of the authority and character of a superior. Found on http://www.encyclo.co.uk/webster/I/99
the quality of being irreverent; lack of reverence or respect. · an irreverent act or statement. · the condition of not being reverenced, venerated, respected, etc. Found on https://www.infoplease.com/dictionary/irreverence