"haunting" in the verb sense
1. haunt, stalk
follow stealthily or recur constantly and spontaneously to
"her ex-boyfriend stalked her"
"the ghost of her mother haunted her"
2. haunt, obsess, ghost
haunt like a ghost pursue
"Fear of illness haunts her"
3. frequent, haunt
be a regular or frequent visitor to a certain place
"She haunts the ballet"
"haunting" in the adjective sense
1. haunting, persistent
continually recurring to the mind
"the cathedral organ and the distant voices have a haunting beauty"- Claudia Cassidy
having a deeply disquieting or disturbing effect
"from two handsome and talented young men to two haunting horrors of disintegration"-Charles Lee
Source: WordNet® (An amazing lexical database of English)
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