glscz

1 impede
to make it difficult for someone or something to move forward or make progress:
Storms at sea impeded our progress.

2 impermeable
not allowing liquids or gases to pass through [≠ permeable]:
No paint is impermeable to water vapour

3 imperturbable
remaining calm and unworried in spite of problems or difficulties

4 impervious[not before noun]
1 formal not affected or influenced by something and seeming not to notice it
impervious to
His ego was impervious to self-doubt.

2 technical : not allowing anything to enter or pass through:
impervious volcanic rock

impervious to

materials that are impervious to water

5 implacable
very determined to continue opposing someone or something:
implacable enemies
The government faces implacable opposition on the issue of nuclear waste.

6 implicit
1 suggested or understood without being stated directly [≠ explicit]
implicit criticism/threat/assumption
Her words contained an implicit threat.
His statement is being seen as implicit criticism of the work of research laboratories.

7 implode
1 technical : to explode inwards [≠ explode]:
The windows on both sides of the room had imploded.

2 written : if an organization or system implodes, it fails suddenly, often because of faults that it has [= collapse]:
Most nations learned their lesson during the 1930s when trade imploded and incomes plunged.

8 inadvertently
without realizing what you are doing [= accidentally]:
Viruses can be spread inadvertently by email users.
Robinson's name was inadvertently omitted from the list.

—inadvertent adjective:
inadvertent exposure to chemicals
—inadvertence noun [uncountable]

9 inchoate
inchoate ideas, plans, attitudes etc are only just starting to develop

10 incongruity
the fact that something is strange, unusual, or unsuitable in a particular situation:
The incongruity of her situation struck Gina with unpleasant force.
incongruity between
He didn't see the slightest incongruity between the idealism of his plays and his own morals.