PETTO-RI ぺっとり
Meanings
・The state in which a slightly sticky substance lightly sticks to the surface.
Examples
・Spread jam on toast.
トーストにジャムをぺっとりつける。
・A few rain-soaked strands of hair were on my cheek.
雨に濡れた髪の毛が数本、頬にぺっとりとついた。
Dogmatic Opinion
The image is that the amount of objects that stick to each other and the surface area become smaller in the following order: Pettari > Pettori > Pittori.
“Petteri” is several dozen centimeters in size (buttocks on the floor).
“Pettori” is several centimeters in scale (jam and hairdressing).
“Pittori” is a few millimeters in size (about the size of the tip of a baby’s pinky finger),
The above is just my personal view.