unsuitable
adj.not right or appropriate for a particular person, purpose, or situation. You use this to describe something that does not fit because it is the wrong style, size, or quality.
adj.inappropriate or unfit for a specific purpose, person, or occasion. Often used to describe content, behavior, or physical conditions that fail to meet required standards or social norms.
“The movie is unsuitable for young children.”
“Heavy wool coats are unsuitable for the tropical climate of the island.”
“The board rejected the proposal, citing that the aggressive expansion strategy was unsuitable for the company's current financial stability and long-term risk profile.”
Typically followed by the preposition 'for' when specifying the target or purpose.
Unsuitable almost always takes the preposition 'for' rather than 'to' when describing a situation or event.
“This is mainly due to concerns about people offering unsuitable foods and birds becoming dependent on humans.”
From un- + suitable.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.