blackfly

a bad tooth, dental caries, a cavity

(slang, sumo) the lowest rank in major-league sumo, so called because the 力士 (rikishi, “sumo wrestler”) names are displayed at the bottom of the 番付 (banzuke, “sumo rankings list or program”) in a small font, requiring the use of a magnifying glass to read easily

weakling, scaredy-cat

something done or given freely, as volunteer work or love / something free of charge; something for which no price is paid

sauna

no religious affiliation

chawanmushi, Japanese steamed egg

being unemployed

independent, especially of political party