てきせつ適切tekisetsu
1.

Describing something that is well-suited or fitting for a particular situation or context.

2.

Signifying an action or decision that aligns appropriately with the given circumstances, demonstrating a sense of appropriateness or suitability.

3.

Referring to the quality of being relevant or applicable, ensuring that it meets the necessary standards or requirements for a specific purpose.

Example:

「行った」というのが適切な言葉だ。

ふてきせつ不適切futekisetsu
1.

Describes a situation or action that is inappropriate or lacking in suitability for the context it is in, leading to potential misunderstandings or negative consequences.

2.

Refers to a manner of handling or responding to an issue that does not meet the accepted standards or expectations, often resulting in discomfort or offense.

3.

Indicates a lack of appropriateness in behavior or remarks, suggesting that the chosen approach fails to align with social norms or the needs of a particular situation.

Example:

その計画はいくつかの点で不適切なものであると思う。