say it: STAHRT-ling
startling is an adjective meaning "so remarkably different or sudden as to cause momentary shock or alarm". It carries one recorded sense.
so remarkably different or sudden as to cause momentary shock or alarm
“Sydney's startling new Opera House”
“startling news”
“startling earthquake shocks”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for startling come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.