noun / adjectival noun:

• cruel and heartless; merciless; implacable; cold-blooded - four character idiom

noun / adjectival noun:

• heinous; treacherous; atrocious; diabolic; fiendish; inhuman - four character idiom

noun / adjectival noun:

• peace and quiet; safe and peaceful; tranquil and uneventful - four character idiom

noun / adjectival noun / ~の noun:

• hyperconsciousness; too great a sense (of); something being only one's imagination; letting imagination run away with one - four character idiom

~たる adjective / ~と adverb:

• being in a hazy state; being only half conscious; feeling dopey - four character idiom

noun / adjectival noun:

• strong determination; strong-willed; having strong will power; firmness of purpose - four character idiom

noun / adjectival noun:

• stubborn and short-tempered - four character idiom

adjectival noun / adverbial noun / noun:

• one cup after another; cup by cup - four character idiom
• to the limit; to the fullest extent; absolutely the limit; the best one can do; breaking even - usually written using kana alone

~たる adjective / ~と adverb:

• awe-inspiring; majestic; commanding; stately; with an imposing air; in a stately (dignified) manner - archaism - four character idiom

~の noun / ~たる adjective / ~と adverb:

• full of zeal; highly motivated; very eager - four character idiom

noun / adjectival noun:

• polite and courteous - four character idiom

noun / adjectival noun / ~の noun:

• permanence; forever unchanging - four character idiom

noun / adjectival noun / ~の noun:

• somewhat reserved (diffident); shyly; timidly; retiringly; in a retiring (reserved) manner - four character idiom

noun / adjectival noun:

• gentle and reticent - four character idiom

noun / adjectival noun:

• refined, dignified, elegant; graceful; exquisite - four character idiom

noun / adjectival noun / ~の noun:

• at one's sweet will; doing whatever one pleases; however one pleases

noun / adjectival noun:

• simple, easy, and convenient - four character idiom

noun / adjectival noun:

• clear and concise - four character idiom

noun / adjectival noun:

• being of very robust health - four character idiom

noun / adjectival noun:

• simple, plain, and artless; clear, concise, and unaffected - four character idiom

noun / adjectival noun:

• simple and plain; frank, direct and unambivalent; straightforward - four character idiom

noun / adjectival noun / ~の noun:

• having great (impressive, commanding) presence; having an air of importance; having enough gravity for (a position) - four character idiom

noun / adjectival noun / ~の noun:

• lacking enough gravity for (a position, task); being an insignificant figure for (a position) - four character idiom

noun / adjectival noun:

• self-willed; (doing or saying things) to suit one's own convenience - four character idiom

noun / adjectival noun:

• as selfishly (willfully) as one pleases - four character idiom