σιγή ποτ' ἐστὶν αἱρετωτέρα λόγου → sometimes silence is preferable to words (Menander)
philosophical: P. φιλόσοφος.
concerned with speculation: P. θεωρητικός.
doubtful, problematical: P. and V. ἀφανής, ἀσαφής, ἄδηλος.
