Where does “constantly” come from?

Constantly derives from Middle English -ly, Old English -līċ, Latin constantem, Latin constans, Latin constare, and Latin com-, ultimately from Latin con-.

constantly (English): With steadfastness; with resolve; in loyalty,...

Definitions

With steadfastness; with resolve; in loyalty,...

Ancestry of “constantly”, step by step

Step	Language	Word	Meaning
1	English	constant	Unchanged through time or space; permanent;...
2	Middle English	constant	—
3	Old French	constant	—
4	Latin	cōnstantem	—

Every word from Latin cōnstantem →

constantly — Etymology, Origin & Word History | Etymology Explorer