Yes, they agree in gender and number. a singular masculine adjective usually has "-ый" or "-ой" endings; a feminine one has "-ая" ending; a plural adjective has "-ые" ending; "скучный день" - a boring day ("день" - is a masculine noun) "скучная работа" - a boring job ("работа" - is a feminine noun) "скучные люди" - a boring people ("люди" - is a plural noun)

http://www.russianforeveryone.com/ http://www.russianforeveryone.com/Rufe/Lessons/Course1/Summary%20Tables/Verbs_Irreg.htm http://www.russianforeveryone.com/Rufe/Lessons/Course1/Summary%20Tables/Pronouns_PersInter.htm http://www.russianforeveryone.com/Rufe/Lessons/Course1/Summary%20Tables/NounAdjective%20Endings_1.htm http://www.youtube.com/watch?v=dq32zN0umAw http://www.youtube.com/watch?v=g1Ttff9ZEEU

http://www.youtube.com/watch?v=CUVNA_loG_o&list=PL82F4D00421E82DB0 RL102 - 1 Basic Russian grammar lesson 1

http://www.youtube.com/watch?v=GXMNS0lHumE Имя прилагательное как часть речи http://www.youtube.com/watch?v=iDEJU1XR4TI&list=PL2978238A58296F3B&index=33 Some video about Russian Grammar