crucial
From LSJ
Ἐλευθέρου γάρ ἐστι τἀληθῆ λέγειν → Perhibere vera semper ingenuum decet → Die Wahrheit sagen ist des freien Mannes Art
adj.
Sure, certain: P. and V. πιστός.
Exact, searching: P. and V. ἀκριβής.
Critical: P. ἐπικίνδυνος.
Important: P. ἀξιόλογος.