From merimna; to be anxious about -- (be, have) care(-ful), take thought.
see GREEK merimna
a. to be anxious; to be troubled with cares: absolutely, Matthew 6:27, 31; Luke 12:25; μηδέν μεριμνᾶτε, be anxious about nothing, Philippians 4:6; with the dative of the thing for the interests of which one is solicitous (cf. Winer's Grammar, § 31, 1 b.): τῇ ψυχή, about sustaining life, τῷ σώματι, Matthew 6:25; Luke 12:22; περί τίνος, about a thing, Matthew 6:28; Luke 12:26; εἰς τήν αὔριον, for the morrow, i. e. about what may be on the morrow, Matthew 6:34; followed by an indirect question πῶς ἤ τί, Matthew 10:19; Luke 12:11 (here Tr marginal reading omits; Tr text WH brackets ἤ τί); joined with τυρβάζεσθαι (θορυβάζεσθαι) followed by περί πολλά, Luke 10:41 (WH marginal reading omits)
b. to care for, look out for (a thing); to seek to promote one's interests: τά ἑαυτῆς, Matthew 6:34 Rec.; τά τοῦ κυρίου, 1 Corinthians 7:32-34; τά τοῦ κόσμου, 1 Corinthians 7:34; ἑαυτῆς, Matthew 6:34 L T Tr WH (a usage unknown to Greek writers, although they put a genitive after other verbs of caring or providing for, as ἐπιμελεῖσθαι, φροντίζειν, προνόειν, cf. Krüger, § 47, 11; Winers Grammar, 205 (193); Buttmann, § 133, 25); τά περί τίνος, Philippians 2:20; ἵνα τό αὐτό ὑπέρ ἀλλήλων μεριμνῶσι τά μέλη, that the members may have the same care one for another, 1 Corinthians 12:25. (The Sept. for דָּאַג, to be anxious, Psalm 37:19