demanding

adj

1. Requiring much endurance, strength, or patience.

   “This bike is built to withstand even the most demanding terrain.”

2. Making great demands in terms of quality, quantity, accuracy or other criteria; difficult to satisfy.

   “Near-synonyms: see Thesaurus:fastidious”

   “Our wines will satisfy even the most demanding of connoisseurs.”

   “When you love someone, it's natural, not demanding / And that's one thing I'm proud to say I found in you / I'm so glad we reached an understanding / Now I know my heart is safe with you, ooh”

verb

1. (form-of, gerund, participle, present)present participle and gerund of demand

noun

1. The act of making a demand.

   “She had had enough whimperings and demandings this morning to last her a week, and her face hardened as a tear rolled down Sarah's cheek.”