Strong’s Greek
G171 — akairos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀκαίρως
akairos — pronounced ak-ah'-ee-roce
adverb from the same as 170; inopportunely:--out of season. see GREEK for 170
1 occurrence in the KJV.
2 Timothy 4:2
Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.