late 14c., "contemplative," also "purely scientific, in theory only" (opposed to practical), from Old French speculatif "worth great attention; theoretical," or directly from Late Latin speculativus, from past participle stem of speculari (see speculation). Meaning "given to (financial) speculation" is from 1763. Related: Speculatively.
例文
1. He has written a speculative biography of Christopher Marlowe.
彼はクリストファー?マローに関する推定伝記を書いた。
2.The papers ran speculative stories about the mysterious disappearance of Eddie Donagan.
各紙にエディ?ドナガンの謎の失踪に関する憶測記事が掲載されている。
3.His mother regarded him with a speculative eye.
彼の母親は好奇心のある目で彼を見ていた。
4.She cast a speculative look at Kate.
彼女は疑問げな目つきでケイトをちらっと見た。
5.The boss has put all his money into that speculative enterprise.