na-adjective
Used to describe something done with full effort, commitment, or scope, often in formal or written contexts.
政府は全幅的な支援を約束した。
The government promised full-scale support.
彼は全幅的な信頼を寄せている。
He places complete trust in her.
Compound of 全幅 (full width, wholehearted) + 的 (-like, -ic). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of full-scale or complete.