Extended Strong's Greek Lexicon (Abbott-Smith based)
to groan
Usage: στενάζω [in LXX for אָנַח ni., אָנַק, etc. ;] to groan ("the word denotes feeling which is internal and unexpressed," Mayor, Ja., 162): Mrk.7:34, 2Co.5:2 5:4, Heb.13:17, Jas.5:9 (EV, murmur); ἐν ἑαυτοῖς, Rom.8:23 (cf. ἀνα-, συ(ν)-στενάζω).† SYN.: see: κλαίω (AS)