not to mention ..., needless to say ..., not to speak of ......

sparse, thin, scattered...

underpopulation, low population density, depopulation

estrangement, alienation, neglecting to stay in contact

alienation, estrangement, leaving (someone) out...

evacuation (to the country), spreading out (troops), deployment...

(mutual) understanding, communication, passing without obstruction

incompletely, insufficiently, partially...

empty (e.g. argument), insubstantial, hollow...

(reciprocal) communication, (coming to a) mutual understanding

(reciprocal) communication, (coming to a) mutual understanding

distant (from someone), aloof, estranged...

to shun, to avoid, to ostracize...

alienation

carelessness, negligence, oversight

sparse woods

canal, drainage, hydrophobic

prolonged silence

rough, careless, reckless...

coarseness and fineness, sparse or dense (growth)

coarse, crude, rough

explanation (for purpose of convincing a judge)

slipshod, sloppy, shoddy

wanting to remain distant, alienation, estrangement...

drizzle, scattered rain

humble fare, simple meal

disagreeable, unpleasant, adverse...

to shun, to avoid, to ostracize...

unfriendly, distant, cold

(detailed) commentary, notes, comments