when something unpleasant continues for a long time► continual use this about something annoying or unpleasant that continues for a long time without stopping: · The deadline was getting closer and we were under continual pressure to reach our targets.· The exhaustion felt by new parents comes from the continual disturbance of their sleep patterns.
► constant use this about an unpleasant or frightening situation that continues for a long time without stopping: · She has learned to put up with the constant roar of trucks and cars whizzing by.· People under the regime lived in constant fear.· Lehman is in constant pain, and suffers from a severe form of arthritis.
► perpetual use this about an unpleasant or upsetting situation that is always there and does not change: · For many working mothers, balancing the demands of children and job is a perpetual strain.· Those who remain in the city are in perpetual danger of being hit by bullets and shells.
► incessant something unpleasant and annoying, especially a noise, that is incessant continues over a long period of time and never stops: · Outside the window is the incessant noise of cars and buses.· She gave two- or three-word answers to reporters' incessant questions .· The incessant rain has meant that many matches had to be cancelled.
► nagging: nagging doubt/fear/worry/suspicion etc a doubt etc that is probably unnecessary but that stays with you all the time and does not go away: · She had a nagging worry that she hadn't done enough to prepare.· I have a nagging feeling that I forgot to do something.· There are still some nagging doubts about the future of the company, though for now it is doing well.
► endless/unending/never-ending use this about something unpleasant, boring, or tiring that continues for so long that you think it will never end or change: · How can I stop my children's endless quarrelling?· The wet winter days seemed at times unending.· His immune system failed, and he caught a never-ending series of viruses and infections.
► persistent a persistent problem or illness is not very serious but it continues to exist even though you try to get rid of it: · He has a persistent cough because of his smoking.· The country has suffered from persistent economic problems.
► unrelenting formal an unpleasant situation or feeling that is unrelenting continues for a long time without stopping: · The unrelenting pressures of the job started to affect her health.· The relief efforts have been hindered by unrelenting bad weather.· The unrelenting air attack on the country continued.