ill at ease is an adjective meaning "socially uncomfortable; unsure and constrained in manner". It carries one recorded sense.
socially uncomfortable; unsure and constrained in manner
“awkward and reserved at parties”
“ill at ease among eddies of people he didn't know”
“was always uneasy with strangers”
Definitions, synonyms and semantic relations for ill at ease come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.