1hol·low 
/ˈhɑ:loʊ/ adjective
hol·low·er; hol·low·est /ˈhɑ:loʊ/ adjective 1 : having nothing inside : not solid
▪ a hollow log 2 : curved inward or down
▪ hollow [=sunken] cheeks ▪ There was a hollow spot in the field. 3 : not having real value or meaning
▪ They achieved a hollow victory over a team missing its best players. [=their victory was not an important or impressive one since the other team was missing its best players] ▪ She made hollow promises. [=she made promises she would not keep] ▪ Their threats ring hollow. = Their threats have a hollow ring. [=their threats do not seem truthful or sincere] 4 ◊A sound that is hollow is like the sound made when you hit something that is empty inside.
▪ He heard a hollow sound when he knocked on the wall. 5 : weak and without any emotion
▪ “It's useless,” he said in a hollow voice. ▪ a hollow laugh
▪ a hollow log
▪ hollow [=sunken] cheeks ▪ There was a hollow spot in the field.
▪ They achieved a hollow victory over a team missing its best players. [=their victory was not an important or impressive one since the other team was missing its best players] ▪ She made hollow promises. [=she made promises she would not keep] ▪ Their threats ring hollow. = Their threats have a hollow ring. [=their threats do not seem truthful or sincere]
▪ He heard a hollow sound when he knocked on the wall.
▪ “It's useless,” he said in a hollow voice. ▪ a hollow laugh
— hol·low·ly /ˈhɑ:ləli/ adverb
▪ “It's useless,” he said hollowly.
/ˈhɑ:ləli/ adverb ▪ “It's useless,” he said hollowly.
— hol·low·ness noun [noncount]
▪ the hollowness of her promises
▪ the hollowness of her promises
