Thwack

plätsis

(used to represent the dull or heavy sound of someone or something being hit or slapped)

tömpsis

(used to represent the dull or heavy sound of someone or something being hit or slapped)

läimäys

(act of hitting hard, especially with a flat implement or a stick — see also whack)

rojahdus

(dull or heavy slapping sound)

läimäyttää

(to hit (someone or something) hard, especially with a flat implement or a stick)

läjähtää

(to fall down hard with a thump)

paiskata

(to drive or force (someone or something) by, or as if by, beating or hitting)

rojahtaa

(to fall down hard with a thump)