Where does “subtilely” come from?
subtilely (English) comes from English subtile, from Middle French subtilité, from Latin subtīlitās, from Latin subtīlis, from Latin tēla, from Old Dutch tegela, from Proto-Germanic *tigulā, from Proto-Germanic tigulǭ — to cover; pole, stick, beam.
subtilely (English): Obsolete form of subtly
Ancestry of “subtilely”, step by step