Lexical Definition

‎θάρσος‎ thársos (thar'-sos) courage/confidence ^G:N-N
akin (by transposition) to (daring)

courage.

• boldness (subjectively)

Abbott-Smith

θάρσος, -ους, τό,
courage: Ac 28:15.†

Abbott-Smith References

Liddell-Scott-Jones

θάρσος,

Attic dialect θάρρος, Aeolic dialect θέρσος (which see), εος, τό, (θρασύς) courage, [Refs 8th c.BC+]; θ. τινός courage to do a thing, [Refs 5th c.BC+]: with genitive, courage against.. , πολεμίων [Refs 5th c.BC+]; θ. ἴσχε take courage! [NT+8th c.BC+]; τῷ δ᾽ ἐνὶ θυμῷ θῆκε.. θ[Refs 8th c.BC+]; παρασχεῖν, ἐμποιεῖν τινι, [Refs 5th c.BC+]; θ. ἐγγίγνεται, ἐμπίπτει τινί, [Refs 5th c.BC+]

__2 that which gives courage, ὀλολυγμόν.., θάρσος φίλοις [Refs 4th c.BC+] grounds of confidence, [Refs 5th c.BC+]
__II rarely in bad sense, ={θράσος}, audacity, θάρσος ἄητον ἔχουσα [Refs 8th c.BC+]; μυίης θάρσος ἐνὶ στήθεσσιν ἐνῆκεν the reckless persistence of a fly, [Refs].—On the different of θάρσος and θράσος, see at {θράσος}.

_{LSJ Scripture Refs: Acts.28.15}