Not understand (BG and SB)

Expressions researched:
"never understand" |"never understands" |"no understanding" |"not have understood" |"not understand" |"not understands" |"not understood"

Notes from the compiler: VedaBase query: "not understand" or "not understood" or "not understands" or "no understanding" or "not have understood" or "never understand" or "never understands" not "do not understand" not "don't understand" not "does not understand" not "doesn't understand" not "did not understand"not "didn't understand"