The Word is:”problem”
noun: problem; plural noun: problems
1. a matter or situation regarded as unwelcome or harmful and needing to be dealt with and overcome.
“they have financial problems”
catch-22, vexed question, quandary, the rub;
predicament, plight, can of worms, hornets’ nest, Gordian knot;
misfortune, mishap, misadventure;
informal dilemma, headache, prob, hassle, pickle, fix, tight spot, fly in the ointment, how-do-you-do, job, gremlin, facer;
“he’s been under increasing stress due to business and personal problems”
informaldrag, pain, pain in the neck;
vulgar slangpain in the arse
“‘I don’t want to be a problem,’ Lucy said”
“motivation of staff can also be a problem”
denoting or relating to people whose behaviour causes difficulties to themselves and others.
“practitioners help families develop strategies for managing problem behaviour in teens”
2. Physics Mathematics
an inquiry starting from given conditions to investigate or demonstrate a fact, result, or law.
a proposition in which something has to be constructed.