Ineffectively means in a way that does not achieve what it is meant to achieve. You use it of how someone acts, or how a plan, a tool, or a treatment is used: they argued ineffectively, the ads ran ineffectively, the medicine was used ineffectively. The action happened, but it did not land. It is the adverb of ineffective, and it has the same slightly formal, judging tone. You hear it in reports and careful talk more than in casual chat. Though actually, people sometimes say it when they mainly mean 'badly' or 'in a weak way', which is close, but the core idea is still: the intended result did not come.

無效地、沒效果地