重

paper-thin (difference); razor-thin; very slight

centre of gravity (center)

centroid; barycenter

(one's) balance

serious illness

ちょうほう only; Adjectival nouns or quasi-adjectives (keiyodoshi)

convenient; useful; handy; helpful

ちょうほう only; Noun or participle which takes the aux. verb suru; Transitive verb

finding useful; coming in handy; using often

(priceless) treasure

importance; gravity

leader; authority; mainstay

most important

wholly (due to); entirely; solely

earnestly; intently; sincerely

prioritized; focused; concentrated; predominant

chief vassal; senior statesman

regarding highly; attaching importance to

heavy labor; heavy labour; hard work

hard labor (in prison); hard labour

severe (illness, disability, etc.); serious

triple; treble; threefold; three-ply; triplicate

valuable article; valuables

felony; serious crime

じゅうやく only

(company) director; executive; top management

important post; role with heavy responsibilities

multiple; multiplex

to pile up; to accumulate

heavy (feeling, etc.); gloomy (weather, etc.); oppressive (atmosphere, etc.); stifling; strained

serious; grave; dignified; solemn

repeatedly; over and over again

several layers deep; layer upon layer; row upon row; (folding) several times

to respect; to honor; to honour; to esteem; to prize

to pile up; to stack up; to accumulate