Common Words by Reading

77.5%
nothing ②un-
unreasonable ②excessive (work, etc.) ③to work too hard ④no way ⑤irrational
radio (communication) ②wireless
nothing ②un-
absurd ②rash ③very
disregarding
infinity ②infinite
useless ②unnecessary ③not on business ④prohibited
unintentional
powerlessness
regret ②freedom from obstructive thoughts
unhurt ②flawless (e.g. gem) ③spotless (e.g. reputation)
15.0%
un- ②bad ...
safety ②safely ③good health ④inaction
safely ②in peace
not writing or contacting for a while
safe (e.g. choice) ②acceptable
boredom ②discontent
behaving outrageously as though there were no one around
villainous ②independent
no-holds-barred party
being outnumbered (e.g. in a military context)
superficially polite but actually rude
7.5%
nonexistent ②unowned ③not ④to not be
being ruined ②complete loss of face
inconsiderate ②thoughtless
being without a name
tenth month of the lunar calendar
duckweed ②rootless person
sixth month of the lunar calendar (approx. July) ②June ③triangles of sweet rice jelly topped with adzuki beans (eaten in the sixth month)
uneventful ②easy ③having nothing to do
Others
summer purification rites (held at shrines on the last day of the 6th lunar month)
to be lost (e.g. luggage) ②to be used up ③to disappear (e.g. pain)