忙しい (isogashii) means "busy." This い-adjective describes a state of having many things to do, whether it's work, studies, or other activities, leaving little free time. For example, "今日はとても忙しいです。" (Kyou wa totemo isogashii desu.) means "I am very busy today."

「忙(いそが)しい」はする事(こと)が多(おお)い時(とき)に使(つか)います。例(れい)：今(きょう)日(きょう)は忙(いそが)しいです。