All 13 Uses of

sober
in
Catch-22

Yossarian looked at him soberly and tried another approach.†
Chpt 5

soberly = in a serious manner

He was an ambitious and humorless Lieutenant Scheisskopf, who confronted his responsibilities soberly and smiled only when some rival officer at the Santa Ana Army Air Force Base came down with a lingering disease.†
Chpt 8 *

They gathered soberly in the farthest recess of the ward and gossiped about him in malicious, offended undertones, rebelling against his presence as a ghastly imposition and resenting him malevolently for the nauseating truth of which he was bright reminder.†
Chpt 17

One of the surprising things always was the sense of calm and utter silence, broken only by the test rounds fired from the machine guns, by an occasional toneless, terse remark over the intercom, and, at last, by the sobering pronouncement of the bombardier in each plane that they were at the I.P. and about to turn toward the target.†
Chpt 5

Major Major's father was a sober God-fearing man whose idea of a good joke was to lie about his age.†
Chpt 9 *

An uneasy silence replaced it, and Yossarian was sober and self-conscious as he climbed down from the plane and took his place in the jeep that was already waiting for them.†
Chpt 14

'War is hell,' he declared frequently, drunk or sober, and he really meant it, although that did not prevent him from making a good living out of it or from taking his son-in-law into the business with him, even though the two bickered constantly.†
Chpt 21

'I don't buy eggs in Malta,' he confessed, with an air of slight and clandestine amusement that was the only departure from industrious sobriety Yossarian had ever seen him make.†
Chpt 22

Nately's father was a sober, philosophical and responsible man; this old man was fickle and licentious.†
Chpt 23

Deep otter-brown lines of preoccupation etched themselves permanently into his careworn face and gave him a harried look of sobriety and mistrust.†
Chpt 24

Definitions:

(1) (sober as in: Talk to me when your sober.)
not under the influence of alcohol
(2) (sober up as in: I need to sober up.)
to become less drunk or intoxicated
(3) (sobering as in: a sobering thought)
serious or calm (not silly or excited); or making one serious or less excited
(4) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

More rarely, sober can refer to one who is rational rather than under the influence of extreme emotion. Also more rarely, it can reference that which is practical rather than fanciful -- such as "a more sober plan."