恋しい
こいしい · koishii · JLPT N2 · i-adj
to miss
💌 恋 (love) + しい (adj. ending) = full of love; the ache of missing someone
Built from 恋 (koi, love or longing) plus the adjective ending しい, so it means full of longing. Use it for someone dear who is far away.