"Unusual", yes, that's a very apt description.
Synonyms and examplessuitableThis film contains language that is not suitable for children.
appropriateIs this film appropriate for young children?
fittingThe promotion was a fitting reward for all his hard work.
rightI'm not sure that she's the right person for the job.
perfectIt's a perfect day for a picnic.
in keeping withThe antique desk was very much in keeping with the rest of the furniture in the room.
Antonyms and examplesunsuitableThe venue is unsuitable - far too small for our needs.
inappropriateThat sort of language is inappropriate in classroom discussions.
wrongHe's the wrong person to ask about that.
Go to the thesaurus article about these synonyms and antonyms ofapt.
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If someone or something issuitable, it is acceptable or satisfactory for some purpose.