He spoke to her with an inappropriately familiar tone.
Tips
usage
亵 rarely stands alone. You'll meet it inside compounds: 亵渎 (to blaspheme/profane), 猥亵 (obscene; to molest), 亵昵 (improperly intimate). The 衣 (clothing) component reflects its original meaning: 'underclothes' / 'home clothes,' i.e. private things, and from there, anything that crosses the line into the indecent.
Outer 衣, pictograph of a robe with collar above and skirt panels below, wrapped around the inner element. Originally 亵 meant 'undergarments, intimate clothing', not to be displayed; from that came 'obscene, indecent.' Indexed under Kangxi #8 亠 (tóu) by tradition, taken from the lid-like top strokes of 衣.
Inner 执 sits inside the robe and supplies the sound (zhí to xiè, regular palatal drift across this phonetic series). 执 itself pictures a hand grasping something firmly; here that imagery is incidental, though memorable: something held tightly under your clothes, exactly the indecency or private-impropriety meaning of 亵.
Filed under radical 亠 (tóu, #8) by convention. 亠 is not a separate component in 亵, so no strokes are highlighted.
