the adjective 'taxing' originates from the verb 'tax', which entered english in the 14th century from old french taxer, meaning 'to impose a tax'. this french term derives from latin taxare, a frequentative of tangere ('to touch'), which evolved to mean 'to handle, assess, or censure'. the core semantic thread is the application of pressure or a demand upon something. by the 17th century, the verb had developed the figurative sense of making strenuous demands on one's resources or strength. the addition of the present participle suffix '-ing' transforms this action into an adjective, directly linking the literal act of imposing a financial levy to the modern abstract meaning of being mentally or physically burdensome and demanding.

Structure: tax (to assess, to strain) + ing (adjective-forming suffix) - tax: from latin taxare ('to handle, appraise, censure'), via old french taxer. functions as the core root conveying the sense of imposing a burden or demand. - ing: from old english -ende, a present participle suffix. functions to form an adjective from a verb, indicating the quality or state of performing the action.