faith comes to mind
level
I believe the word you wanted was 'obtuse'.
Planar.
They are said to be congruent
No. The word "quadrilateral" means "having four sides".
Assumption
The person who says that has chosen to believe you without needing any more proof.
A statement accepted without proof is commonly known as a theorem. The other word that is used for such statements is postulate.
allege
Postulate
postulates
Achromatic means being without color or having no color.
I believe the word you are looking for is non-uniformed school.
I believe the word you're looking for is psychopath.
Achromatic means being without color or having no color.
state or assert that something is the case, typically without providing evidence or proof
It indicates the plural without having to write out a separate word.