（よ）うとしないWill not try to
（よ）うとしない says that someone shows no willingness or makes no effort to perform an action. It often conveys criticism, frustration, or concern.
What the construction implies
This is more than a simple negative. The speaker sees an action as possible and expected but judges that the person is unwilling to begin or make the necessary effort. When describing someone else, give an observable basis for that judgment, such as ignored requests, repeated encouragement, or a complete lack of preparation.
Observed unwillingness
店員が何度説明しても、客は注意書きを読もうとしない。
Even after the clerk explains it repeatedly, the customer will not try to read the notice.
AnalyzeThe repeated explanations provide a visible reason for judging the customer's behavior as unwilling.
Not even trying
Insert も after と when the striking point is that the person will not make even the smallest attempt.
熱が三日も続いているのに、父は病院へ行こうともしない。
Even though his fever has lasted three days, my father will not even try to go to the hospital.
AnalyzeThe serious situation makes the speaker's concern and frustration understandable.
Polite reporting
こちらから何度連絡しても、先方は事情を説明しようとしませんでした。
Although we contacted them repeatedly, the other party would not try to explain the circumstances.
AnalyzeAttempt, refusal, and a negative plan
（よ）うとする describes an attempt or the beginning of an action. Its negative form, （よ）うとしない, says that the expected effort is absent. By contrast, ないつもりだ neutrally states a plan not to act, while まい can express a more formal personal resolve not to act.
More examples
母が何度勧めても、祖父は病院へ行こうとしない。
No matter how many times my mother urges him, my grandfather will not try to go to the hospital.
Analyze子どもは眠いはずなのに、ゲームをやめようとしない。
The child must be sleepy, but will not try to stop playing the game.
Analyze彼女は理由を聞かれても、何も答えようとしなかった。
Even when asked for the reason, she made no attempt to answer.
Analyze事故のあと、会社は詳しい経緯を公表しようとしませんでした。
After the accident, the company would not try to disclose the details of what had happened.
Analyze何度話し合いを提案しても、相手は席に着こうともしなかった。
No matter how many times we proposed a discussion, the other side would not even come to the table.
Analyze新人は分からないことがあっても、先輩に相談しようとしない。
Even when the new employee does not understand something, they make no effort to consult a senior colleague.
Analyze