* തീർച്ചയായും (theerchayaayum): This means "definitely" or "certainly" and is a good option for expressing strong affirmation.
* നിശ്ചയമായും (nishchayamayum): This means "assuredly" or "without doubt" and emphasizes certainty.
* സ്പഷ്ടമായി (spashtamaayi): This means "clearly" or "explicitly" and emphasizes clarity.
* നിർണ്ണയിച്ചു (nirnnayichu): This means "decided" or "determined" and emphasizes the act of making a decision.
The best translation will depend on the specific context in which "decidedly" is used.
For example, you could say:
* "He was decidedly (തീർച്ചയായും) the most talented artist in the competition."
* "The evidence was decidedly (നിശ്ചയമായും) against the defendant."
* "The instructions were decidedly (സ്പഷ്ടമായി) clear."
Ultimately, the choice of translation will depend on the specific meaning you want to convey.