certain reasons; certain circumstances; professional constraints; (lit.) adult matters
inquiry; enquiry; investigation; (police) interview; questioning (e.g. witness, suspect); hearing
having good knowledge of a certain matter; person who has good knowledge of a certain matter; informed source
one's financial situation; one's finances; state of one's purse
economic condition; economic circumstances; financial situation
internal (domestic) affairs
traffic conditions (e.g. heavy traffic); transportation situation (e.g. bad roads)
social conditions; social circumstances
given the circumstances; such being the case
circumstances of the office
clausula rebus sic stantibus (legal principle that agreements become non-binding if there is a major, unforeseeable change of circumstances)
lowdown; inside information; hidden circumstances; inside facts; inner workings; undisclosed circumstances
situation report (e.g. after a security incident); report on the state of current affairs