preconceived idea(n = noun.cognition) parti pris, preconceived notion, preconceived opinion, preconception, prepossession - an opinion formed beforehand without adequate evidence; "he did not even try to confirm his preconceptions"
is a kind of opinion, persuasion, sentiment, thought, view

N  misjudgment, obliquity of judgment, miscalculation, miscomputation, misconception, hasty conclusion, prejudgment, prejudication, prejudice, foregone conclusion, prenotion, prevention, preconception, predilection, prepossession, preapprehension, presumption, assumption, presentiment, fixed idea, preconceived idea, id_ee fixe, mentis gratissimus error, fool's paradise, esprit de corps, party spirit, partisanship, clannishness, prestige, bias, bigotry, warp, twist, hobby, fad, quirk, crotchet, partiality, infatuation, blind side, mote in the eye, one-sided views, one-track mind, partial views, narrow views, confined views, superficial views, one- sided ideas, partial ideas, narrow ideas, confined ideas, superficial ideas, one-sided conceptions, partial conceptions, narrow conceptions, confined conceptions, superficial conceptions, one-sided notions, partial notions, narrow notions, confined notions, superficial notions, narrow mind, bigotry, odium theologicum, pedantry, hypercriticism, doctrinaire, overestimation, underestimation, ignorance, erroneous assumptions, erroneous data, mistaken assumptions, incorrect assumptions (error), misjudging, ill-judging, wrong-headed, prejudiced, jaundiced, shortsighted, purblind, partial, one-sided, superficial, narrow-minded, narrow-souled, mean-spirited, confined, illiberal, intolerant, besotted, infatuated, fanatical, entete, positive, dogmatic, conceited, opinative, opiniative, opinioned, opinionate, opinionative, opinionated, self-opinioned, wedded to an opinion, opini=atre, bigoted, crotchety, fussy, impracticable, unreasonable, stupid credulous, warped, misjudged, ex parte, nothing like leather, the wish the father to the thought, wishful thinking, unshakable conviction, my mind is made up - don't bother me with the fact.

crazy idea, idea, preconceived, preconceived notion, preconceived opinion