【Effort】 , 【exertion】 , 【pains】 , 【trouble】 mean the active use or expenditure of physical or mental power in producing or attempting to produce a desired result.
【Effort】 may suggest either a single action or continued activity, but it usually implies consciousness that one is making an attempt or sometimes, even, is laboring or straining to achieve an end.
【Exertion】 in general stresses the active, often vigorous, exercise of a power or faculty. Often, however, especially when not followed by of, 【exertion】 means a laborious 【effort】 .
【Pains】 implies toilsome or solicitous 【effort】 ; 【trouble】 implies 【exertion】 that inconveniences or wastes time and patience.
