noun, noun which may take the genitive case particle 'no'
suitable time; good timing
Refers to the right moment or appropriate timing for doing something. Often used with ～を見計らう or ～に.
そろそろ出かけるのに頃合だ。
It's about the right time to head out.
頃合を見計らって話を切り出した。
I waited for the right moment and brought up the topic.
noun, noun which may take the genitive case particle 'no'
moderation; propriety; appropriate degree
Used for a suitable degree or amount, often in the sense of not going too far. Common in phrases like 頃合の値段 (reasonable price) or 頃合の量 (moderate amount).
この店は頃合の値段で美味しい料理を出す。
This restaurant serves delicious food at reasonable prices.
お酒は頃合にしておきなさい。
Don't drink too much; keep it moderate.
適当 can mean 'appropriate' or 'suitable' but also carries a nuance of 'half-hearted' or 'random' in casual use. 頃合 focuses specifically on timing or degree that is just right, without the negative connotation.
丁度 is an adverb meaning 'exactly' or 'just right', while 頃合 is a noun/adjectival noun referring to the suitable time or degree itself.
Compound of 頃 (ころ, 'time, approximate point') and 合い (あい, 'fitting, matching'). The combination yields the sense of a fitting time or appropriate degree.