na-adjective, noun
unhindered; free from obstacles; unobstructed
Describes a state where nothing blocks or restricts movement, thought, or action. Often used in Buddhist contexts (無碍の境地) but also in general language for unimpeded progress or freedom.
彼は無碍な発想で新しい企画を提案した。
He proposed a new project with unhindered ideas.
この道は無碍に通れる。
This road is passable without obstruction.
From Middle Chinese 無礙 (mju ngaejH), meaning 'without hindrance'. The kanji 無 means 'not' or 'without', and 碍/礙 means 'obstruct' or 'hinder'. The word entered Japanese as a Buddhist term and later gained broader usage.