From Wiktionary, the free dictionary
вя́лый (vjályj) + -о (-o)
вя́ло • (vjálo)
- sluggishly, listlessly, inertly
вя́ло • (vjálo)
- short neuter singular of вя́лый (vjályj)
вя́ло • (vjálo)
- short neuter singular past indicative imperfective of вя́нуть (vjánutʹ)