困難 - 困難な課題

used to refer to something that is inexplicably difficult

非常に挑戦的で複雑な

problems that a person encounters in the early stages of a project or activity

何かの初期段階での問題

said of something that is very complex or difficult for one understands or work with

とても難しい

(of a task) to be very difficult or almost impossible to do or complete

ほとんど不可能なこと

a difficult fight or challenge that requires a lot of effort and determination

非常に難しい、またはやりがいのある仕事

a task or challenge that requires an immense amount of effort, strength, or endurance to accomplish

ほぼ不可能な仕事

a difficult and challenging situation or task that requires significant effort to overcome or complete

難しいまたはやりがいのある仕事

a situation that causes difficulties for one

非常にやりがいのある仕事

to attempt to do something that is beyond one's capability

自分の能力を超えた何かをする

turning really red in the face because of doing a lot of physical activities

桜のように赤い

used to describe a job or task that is too difficult or challenging

the hardest or most boring part of a task or job

仕事の中で最も退屈な部分

a situation that is very difficult because one is not prepared to deal with it

非常に大きな挑戦

to utilize one's final and decisive efforts, often in a critical moment

全力を尽くして