1169 deilós (an adjective derived from deidō, "fear-driven") – properly, dreadful, describing a person who loses their "moral gumption (fortitude)" that is needed to follow the Lord.

1169 /deilós ("fearful of losses") refers to an excessive fear (dread) of "losing," causing someone to be fainthearted (cowardly) – hence, to fall short in following Christ as Lord.

[1169 /deilós is always used negatively in the NT and stands in contrast to the positive fear which can be expressed by 5401 /phóbos ("fear," see Phil 2:12).]

fearful.

From deos (dread); timid, i.e. (by implication) faithless -- fearful.

δεῖξαι — 2 Occ.
Δείξατέ — 1 Occ.
δειξάτω — 1 Occ.
δείξει — 4 Occ.
δείξω — 5 Occ.
δεῖξον — 6 Occ.
ἔδειξα — 1 Occ.
ἔδειξεν — 6 Occ.
δειλίας — 1 Occ.
δειλιάτω — 1 Occ.
δειλοῖς — 1 Occ.
δέους — 1 Occ.
δεῖνα — 1 Occ.
δεινῶς — 2 Occ.
δειπνῆσαι — 2 Occ.
δειπνήσω — 2 Occ.
δείπνῳ — 1 Occ.
δείπνοις — 3 Occ.
δεῖπνον — 8 Occ.
δείπνου — 4 Occ.