na-adjective, noun which may take the genitive case particle 'no'
Formal or written adjectival use, typically modifying nouns such as 処置, 措置, 方法, or 対応; 適切 is often the plainer everyday equivalent.
医師の適宜な処置で、症状は落ち着いた。
The doctor's appropriate treatment brought the symptoms under control.
状況に応じて適宜の措置を講じる必要がある。
It is necessary to take suitable measures according to the situation.
noun, adverb
appropriately; as needed; at one's discretion
Common in instructions, business, and official writing. As an adverb, it means to do something suitably as circumstances require; the noun use is usually bound up with this adverbial function rather than a concrete object.
資料は適宜更新します。
We will update the materials as needed.
休憩は各自で適宜取ってください。
Please take breaks at your own discretion.