Proto-IE: *g(')hAlk(')h-
Meaning: sad
Old Greek: kalkhái̯nō 'to long, desire' (Lyc.) (in LS the same as kalkhái̯nō 'make purple;; make dark and troublous (as a stormy sea); ponder deeply' from kálkhǟ 'murex, purple limpet; purple dye; Chrysanthemum coronarium (purple flower)')
Russ. meaning: печальный
References: WP I 540