Unpromising means showing little sign of turning out well. An unpromising start.
It is a judgement made early and is often wrong, which is why the word is usually followed by but. An unpromising beginning is the standard opening of any success story.
1adjectiveunpromisingShowing little sign of turning out well.
“The unpromising site turned into the best garden in the village.”
unpromising is a quality.
From un- + promising.
Etymology from Wiktionary, CC BY-SA