μαψιδίως

From LSJ

Σιμωνίδης τὴν μὲν ζωγραφίαν ποίησιν σιωπῶσαν προσαγορεύει, τὴν δὲ ποίησιν ζωγραφίαν λαλοῦσαν → Simonides relates that a picture is a silent poem, and a poem a speaking picture | Simonides, however, calls painting inarticulate poetry and poetry articulate painting

Source

French (Bailly abrégé)

adv.
vainement, follement, sans raison.
Étymologie: μαψίδιος.

English (Autenrieth)

rashly (temere), in vain, Il. 2.120; wantonly, Il. 5.759, Od. 3.138, cf. Il. 17.120, Il. 13.627, Il. 2.214.

Russian (Dvoretsky)

μαψῐδίως:
1 беспричинно, безрассудно, напрасно (κεχολῶσθαι Hom.);
2 бесцельно, без дела: κατὰ πρῆξιν ἢ μ.; Hom. по делам или просто так?;
3 дерзко, нагло (ψεύδεσθαι Hom.).