na-adjective
typical; standard; fixed; stereotyped
Describes something that follows a set pattern, convention, or fixed form, often with a nuance of lacking originality or being predictable.
彼の返事はいつも定型的で、面白みがない。
His replies are always stereotyped and lack interest.
この書類は定型的なフォーマットに従って作成してください。
Please prepare this document following the standard format.
標準的 means 'standard' as in conforming to a norm or average, whereas 定型的 implies a fixed, predetermined form or pattern.
Compound of 定型 (fixed form, pattern) + 的 (-like, -ish). The exact historical derivation is uncertain, but the word follows a common pattern of forming adjectival nouns from nouns with 的.