kovettujaa
Kovettujaa is not a standard, widely recognized term in Finnish dictionaries. It is most plausibly understood as a morphological form related to the verb kovettaa (to harden) or to the noun kovettaja (hardener), but it does not correspond to a common inflectional form in contemporary standard Finnish.
If kovettujaa appears in text, it is likely a typographical error for kovettajaa, the standard partitive singular
The root kovetta- comes from kovettaa, meaning to cause hardening. The agent noun kovettaja denotes something
Because kovettujaa is not standard, its use can lead to ambiguity. Writers aiming for clarity in Finnish
kovettaja, kovettuminen, Finnish morphology, Finnish grammar.