Strong's 1380 (δοκέω)

be accounted, (of own) please(-ure), be of reputation, seem (good), suppose, think, trow

compare the base of G1166 (δεικνύω)) of the same meaning; to think; by implication, to seem (truthfully or uncertainly)

a prolonged form of a primary verb, (used only in an alternate in certain tenses;