adjective eerier -·rier, eeriest -·ri·est

1. Now Rare timid or frightened; uneasy because of superstitious fear
2. mysterious, uncanny, or weird, esp. in such a way as to frighten or disturb

Etymology: N Eng dial & Scot < ME eri, filled with dread, prob. var. of erg, cowardly, timid < OE earg, akin to Ger arg, bad, wicked: for IE base see orchestra