suffix
-like; seeming very ...; just like ...
Productive suffix that attaches to nouns, adjective stems, or mimetic words to form na-adjectives expressing a quality or state. Often adds a poetic or emphatic nuance. Common examples include しめやか (quiet and solemn), 華やか (gorgeous), にぎやか (lively), and さわやか (refreshing).
「しめやか」の「やか」は、静かで落ち着いた様子を表す接尾辞です。
The やか in しめやか is a suffix that expresses a quiet and solemn state.
「華やか」や「にぎやか」のように、やかで終わる形容動詞はたくさんあります。
There are many na-adjectives ending in やか, like 華やか (gorgeous) and にぎやか (lively).