What does promising mean?
Promising means Showing promise, and likely to develop in a desirable fashion..
/ˈpɹɑmɪsɪŋ/ · adjective
Showing promise, and likely to develop in a desirable fashion..
a promising young apprentice
The obtained low and anisotropic thermal conductivity, and feasibility of synthesis, in addition to other reports on high electron mobility, make arsenene a promising material for a variety of applications, including thermal management and thermoelectric devices..
So it cannot be supposed that promisings differ from other word-givings in that a word-giver makes a promise only if he or she uses the locution "I promise".
Choose a synonym only when it preserves the intended meaning, tone, and grammar of the full sentence.
Promising means Showing promise, and likely to develop in a desirable fashion..
Common synonyms include prosperous, rosy, auspicious, bright.
The opposite depends on the specific sense.
a promising young apprentice
FreeDictionaryAPI.com / Wiktionary · Original source · CC BY-SA 4.0
Dictionary data is provided by FreeDictionaryAPI.com and sourced from Wiktionary under its stated license.